This has an awesome old-school feel to it. Reminds me the dos game Colonizations.

 Nice use of colours, but as previously stated I think the peice would look much better if there wasn't as many lines in the water.

The ship is much higher quality than the things around it.

I like the colors very much.

 Ah you're definitely right about the sun. I think I will make an edit later like you did T-Mind, thank you!

Also agree about the amount of lines being a bit obnoxious, but I do like the colors they produce together... I think I'll leave that part alone anyway.

 I agree with Manupix, maybe something like this?

http://s21.postimg.org/aggre011v/idea.png

How can the sun be darker than  the sky???

Nice piece other than that. Probably too many lines in the water.