Once, I was with my girlfriend on holidays in Mallorca, Balearic Islands, while having a cup of coffee milk in the interior terrace of a restaurant.

If you mean coffee with milk, I would put latte instead of coffee milk.

We had spent the afternoon walking foraround that beautiful city, and we were a little tired, so we had needed to relax for a while.

The interior terrace was a big and pleasant place, with plenty of sun umbrellas, green plants, and people relaxing, too.

Sometimes, I carry my sketchbook with me, so I did a sketch ofed a salamander that I was seeing atsaw in that moment, andwhile my girlfriend drew the shapes of stones.

When I am gonewent back home I didmade the drawing some bigger and withadded color.

Once, I wasI was recently on holiday with my girlfriend on holidays in Mallorca, in the Balearic Islands, having a cup of coffee with milk in the interior terrace of a restaurant.

We had spent the afternoon walking forthrough/strolling around that beautiful city, and we were a little tired, so we had needed to find a place to relax for a while.

The interior terrace was a big/spacious and pleasant place,, with plenty of sun umbrellas, green plants, and people relaxing too.

Sometimes, I carry my sketchbook with me, so I did a sketch of a salamander that I was seeing at that momenthad spotted, and my girlfriend drew the shapes of stones.

When I am gonegot back home, I did thsome more drawings, some bigger and this time with colour.

Color = USA
Colour = UK

The result was a funny orange salamander in an orange color with blue spots.

or 'The end result was -'

Once, I was with my girlfriend on holidays in Mallorca, Balearic Islands, having a cup of coffee milk in the interior terrace of a restaurant.

Coffee Milk is unclear. Are you referring to a Latte?
"Having a cup of coffee"
"Having a latte"

We had spent the afternoon walking foraround that beautiful city, and we were a little tired, so we had needed to relax for a while.

The interior terrace was a big and pleasant place, plenty of sun umbrellas, green plants, and people relaxing too.

Sometimes, I carry my sketchbook with me, so I did a sketch of a salamander that I was seeingsaw at that moment, and my girlfriend drew the shapes of stones.

When I am gone back home I direturned home I recreated the drawing some, but bigger and with color.

The result was a funny orange salamander in an orange color with blue spots.

We had spent the afternoon walking forin that beautiful city, and we were a little tired, so we had need to relax for a while.

Sometimes, I carry my sketchbook with me, so I did a sketch of a salamander that I was seeing at that moment, and my girlfriend drew the shapes of the stones.

When I am gone back home, I did the drawing some bigger and with color.

I don't quite understand what you mean by 'I did the drawing some bigger and with color.'

The result was a funny orange salamander in an orange color with blue spots.