Love how you blend those colors together, especially at the top where you blend the castle-thing into clouds. Very stylish in your use of the darkest shade, and it radiates in boldness. AA isn't bad neither.
I honestly have no idea what it is exactly though.
Besides that, I have a few crits. Towards the bottom, the castle(?) seems flat. You could solve that by lightening up the middle panel(?) and darkening the 2 at the ends.
Nice rocks(?).
I like something I don't get.
