Hmm...okay ^^

I am not very good with colors...i useally woud draw everything black and white...

I keep this in mind for next time i do something similar ^^

This is cool, good practice to make carefully controlled small pieces.

There is a visual priority problem: the clouds take precedence over the tower. The reason is the darkish sky, in which the tower greys are lost but the clouds stand out. But a brighter sky might have the undesirable effect of losing the yellows. Needs further experimenting: try a pink or greenish sky, or change the tower colors (those greys are sad, generally avoid pure neutrals)?

The 2 least used colors are likely accidental.