9/10 Great job. Very nice bg work. I dunno about that purple spot though. 'Cause there's a really good balance of white, orange, red, yellow and brown, but then you see a part that is purple and it kinda sticks out.
First: 8/10 because of the text, the rest is awesome 2nd: 8/10 . What's with that thing on the upper right corner? :/ 3rd: 8.5/10 nice overall, render could be blended more.
7/10, not to bad there mate, colors and design looks nice. Only thing you really need to work on is the background.