.. sorry but these people rating this sig are slightly on the noobish side of GFX?
im not saying its a realy bad sig or anything But.. its needs work ok?
for starters you need to work on your background, the smudging around him is a bit badly-worked on.
when smudging you need to make new layers smudge on them add layer modes etc, etc.
try using all diffrent brushes. this sig has good lighting.
try adding depth by blurring somthings, add filters, and FX.