I met this little creature on the lawn under my office this morning.

Unless you're working outdoors, the lawn will not be under your office. Do you mean to say that your office is located upstairs from the lawn?

When I saw it at first glance, IAs soon as I saw it, I already kneow it had alrethat it hady made my day.

It was cute and swift, while jumping around to find food, cute and swift.

Seeing this scene, I all of a suddenly thought of my childhood.

When lunar May came, it was also the wheatBack then, I remember the lunar month of May was also harvesting season for wheat.

During this period of time, the weather was prettusually very nice.

It was warm but not too hot.

I can still remember the scene of brightmorning sun shineing through the leaves shining on my window in the morning, and what's more was t. There were many orioles and pied starling twitter(?) chirping on the trees in my front yard.

I'm not sure what pied starling is.

The image iwas so beautiful, that even now, I canit is still paint it outimprinted in my head.

But unluckUnfortunately, these two kindtypes of birds justonly visited our village at this specific time of the year and they just stayed for one month or so and then you couldn'tfor one month during this time, so we wouldn't be able to see them again until the nextfollowing year.

Back to what the bird I saw this morning. It was a magpie.

YouThey could see thembe seen very often back to decades ago in the countryside, but you can rarely see them in the following twenty years, not to say in thenow they are rarely seen, especially in a bustleing city.

I used the passive form instead of "you". This way, the sentence is more neutral and more descriptive.

Today it went downtown to have a good time and that shows our living environment is really getting better, especially in the green works.

I'm not sure who went downtown, you or the magpie. Also, I'm not sure I understand what you're trying to say. What are "green works"?

Hello magpies, you're welcome to come often.back anytime.

I met this little creature on the lawn unoutsider my office this morning.

WThen moment I saw it at first glance, I knew it had already, I already knew it would madke my day.

Usually, when people say "at first glance," they are describing a first impression that they change their minds about. E.g., "At first glance, the problem appeared simple, but it turned out to be quite complicated."

"Would make" because you're using the conditional (I think?).

Seeing tThis scene, I suddenly thought reminded me of my childhood.

What you wrote was correct, but it sounded a little odd. I think "reminded" is the word you're looking for.

During this period of time, the weather was pretty nice.

I can remember the scene of bright sunshine shining through the leaves shining on my window in the morning, and what's more was there were many, as well as the orioles and pied starlings twittering on the trees in my front yard.

I shortened this sentence to make it smoother and more to the point. I like this description, it's very vivid and poetic :)

The image is so beautiful, even now, I can still paint it out in my headsee it in my mind's eye.

"In my mind's eye" is a really good idiom to use here. This article talks about the history of the phrase:
https://www.phrases.org.uk/meanings/minds-eye.html

But unluckfortunately, these two kinds of birds just visited our village at this specific time of the year and they just stayed for onefor one particular month or, so and then you couldn't only see them until the nextonce a year.

My correction means exactly the same thing, but it's more concise and easier to understand.

Back to what tThe bird I saw this morning was a magpie.

I can't think of a good transition phrase to use here...I would probably just start a new paragraph.

You could see them very often back to decades ago in the countryside, but you can rarely see them in the following twenty years, not to saA few decades ago, you could often see them in the countryside, but since then, they've been harder and harder to spot, especially in the bustle of the city.

Again, same meaning, just phrased more naturally. In this instance, "to spot" means see/notice/recognize. It's often used with animals ("The other day, I spotted a deer crossing the road").

Today it, the magpie went downtown to have a good time, and that shows our living environment is really getting better, especially in the green workserms of greenery.

Greenery = any green plants, vegetation, and plants in general.

Hello, magpies,. You are welcome to come more often.!

I'm not sure why, but "come often" just doesn't sound right to my ear. You could say "come more often" or "visit more often."

Seeing this sceneAs I watched the bird, I suddenly thought of my childhood.

"Seeing this scene" is ok. "To watch" is a better verb since you see an action happening. I would not call this a scene but that's my personal opinion.

I can remember the scene of bright sunshine through the leaves shining on my window in the morning, and what's more was there were many orioles and pied starling twittering on the trees in my front yard.

But unlucky,Unfortunately these two kinds of birds just visited our village at this specific time of the year and t. They just stayed for one month or so and then you couldn't see them until the next year.

Use "and" only once in a sentence.

Back to what the bird I saw this morning, it was a magpie.

I would re-write this as: The bird I saw this morning, however, was a magpie.

You could see them very often back to decades ago in the countryside, but you can rarely see them in the followingpast twenty years, not to sayespecially not in the bustleing city.

Today it went downtown to have a good time and that shows our living environment is really getting better, especially in the green works.

Hello, magpies, you are welcome to come often.

Use a comma after greetings and when you address something/someone:
Hello, kitty!
Good evening, kitty.
I see you, kitty!
Where are you, kitty?

The image iwas so beautiful, even now, I can still paint it ouout it in my head.¶

Keeping the tense the same

But unluckily, these two kinds of birds justonly visited our village at this specific time of the year and they justonly stayed for one month or so and then you couldn't see them until the next year.

Back to what the bird I saw this morning was a, the magpie.

Im not sure the meaning youre trying to convey here... :(

You could see them very often back to decades ago in the countryside, but you can rarely see them in the followingrecent twenty years, not to saespecially in the bustleing city.

“Back to decades ago” isnt a phrase; “in the following twenty years” is used if the referred point in time is already the past; bustle is a noun, bustling is an adjective

Hello magpies, you’re welcome to come often.

Sounds more natural, although not necessary here :)