I think you have great potential!
The line art was quite impressive, I really do enjoy this piece.
My only true complaint is your color count, there are at least 16 shades of blue.
This being said I made some edits, I adjusted some of the line art.
I reduced the color count substantially, and of course reshaded.
Here is my edit:
I don't really have a whole lot of CC.. I think you just need to keep at it and with time and patience you will be spectacular artist.
Please do not give up and keep pixeling, I look forward to seeing you progress.
You have sincerely impressed me.
-Mat
-Mat