A cotton-like white cloud is slowly moving from the right to the left oin the blue sky inout my window. A cotton-like white cloud is slowly moving from right to left in the blue sky out my window.

A cotton-like white cloud is slowly moving from the right to the left onin the blue sky in my window. A cotton-like white cloud is slowly moving from right to the left in the blue sky in my window.

A cotton-like white cloud is slowly moving from the right to the left onacross the blue sky in my window. A cotton-like white cloud is slowly moving across the blue sky in my window.

(Another option)

A cotton-like white cloud is slowly moving from the right to the left on blue sky inoutside my window. A cotton-like white cloud is slowly moving from the right to the left on blue sky outside my window.

There's a three-or-four-story building across the street and it is pretty much occupying my view. There's a three-or-four-story building across the street and it is pretty much occupying my view.

It may be better to write: occluding my view (If you mean that you cannot see beyond the building).

There's a three-or-four-story building across the street and it is pretty much occupyblocking my view. There's a three-or-four-story building across the street and it is pretty much blocking my view.

(Another option)

There's a three-or-four-story building across the street and it is pretty much occupying most of my view. There's a three-or-four-story building across the street and it is occupying most of my view.

The main color is a thick reddish brown. The main color is a thick reddish brown.

The main color is a thick reddish brown. The main color is a thick reddish brown.

The main color is thickdeep reddish brown. The main color is deep reddish brown.

"Thick" is also probably okay, but I'd say "deep" is a common translation of 濃い for colors.

The wall is decorated in Art Deco style, and the vertical rectangular areas, which are takingtake a lot of spaces, are painted in thick forest green, and at the top of the each panel, there is a smaller horizontal panel with a plant-like, geometrical design, and these are painted in thick gold (or is that yellowish brown? The wall is decorated in Art Deco style, and the vertical rectangular areas, which take a lot of space, are painted in thick forest green, and at the top of each panel, there is a smaller horizontal panel with a plant-like, geometrical design, and these are painted in thick gold (or is that yellowish brown?

The wall is decorated in Art Deco style, and the vertical rectangular areas, which are taking up a lot of spaces, are painted in thick forest green, and at the top of the each panel, there is smaller horizontal panel with plant-like, geometrical design, and these are painted in thick gold (or is that yellowish brown? The wall is decorated in Art Deco style, and the vertical rectangular areas, which are taking up a lot of spaces, are painted in thick forest green, and at the top of the each panel, there is smaller horizontal panel with plant-like, geometrical design, and these are painted in thick gold (or is that yellowish brown?

The wallIts facade is decorated in an Art Deco style, and the vertical rectangular areas, which are taking a lot of spaces, are painted in thick forest green, and a. At the top of the each panel, there is smaller horizontal panel with a plant-like, geometrical design, and these are painted in thick gold (or is thait yellowish brown?) Its facade is decorated in an Art Deco style, and the vertical rectangular areas, which are taking a lot of space, are painted thick forest green. At the top of each panel, there is smaller horizontal panel with a plant-like, geometrical design, painted in thick gold (or is it yellowish brown?)

The "outside" wall of a building, you can use "facade" (originally French but used in English now) or "exterior."

The wall is decorated in an Art Deco style, and the vertical rectangular areas, which are taking up a lot of spaces, are painted in thick/deep forest green, and a. At the top of the each panel, there is smaller horizontal panel with a plant-like, geometrical design, and these are painted in a thick/deep gold (or is that yellowish brown? The wall is decorated in an Art Deco style, and the vertical rectangular areas, which are taking up a lot of spaces, are painted in thick/deep forest green. At the top of each panel, there is smaller horizontal panel with a plant-like, geometrical design, and these are painted in a thick/deep gold (or is that yellowish brown?

I always learned that you shouldn't connected more than two independent clauses, especially with the same conjunction, like A, and B, and C. It can be more smooth to write A, and B. C. You may be able to connect three clauses if you have different conjunctions, but the sentence might still be too long. A, and B, but C. A, and B. However, C.