Looking good! they are all very game like, though there is one part you might wnt to look at. The right hnd side of the scren is very blank. Most game menus, when they have this blank patch, have there logo in the bottom right hand corner. maybe make a logo to fill up the blank patch?
agreed - watch your composition, but how about using a block colour in the background - something more bold? For some ideas for devising strong, dynamic colour palettes, go here...http://ucarochester-cgartsandanimation.blogspot.co.uk/2010/12/online-colour-scheme-designer-and-its.html