please comment.

Robinho Signature by ~Robinho1010 on deviantART

well the blur effect on the render doesn't look qood m8 try another one
the text could be better as well try to use a simplier font and don't blur it either
the backqround looks very simple try to add some textures and also improve the liqhtinq ]

lighting looks nice
bg looks simple add textures and make it more intersting
render looks blury
sharpen the sig
text could be better
keep practice man