Is that a base? Eek eek eek! I see you used the spray tool or very soft brush for everything. Never do that! It gives everything an amateur look, and fails to capture the proper texture of most things other than skin and clouds. Although it can be intimidating, try using harder brushes for most things, I can promise you it will look better! Good luck!

Laziness enjoyed. :D
With that being said, since there isn't anymore, I'm only going to give you a 3.5. Keep up the good work!