K i'll just list little things:
-No border
-Seems to be two focal points (atleast to me) I see the text then I see the hat. Should only be one focal point
-Text is too big, placement
-Too simplistic of a background, very bland and empty
-render looks too blurry
Suggestions:
Keep practicing, Look up tutorials
http://www.pixel2life.com has tutorials and google for tutorials to get some practice and learn techniques and get yourself more comfortable with photoshop and all it's tools. Good luck in the future <3 Don't give up!