I think you should quit, while you still have respect. =)
Lol. :P Awsome. I will never give up. >.<
thats a very unsual piece. its very ery random and it all doesnt seem to fit or follow a theme. the black / white grunge brushes need colourikng and the render clashes with the BG. simple but unfinished texct, pretty gooid but nerw colour needed.
work on it some more. try to start learning a little bit of techinques so you dont rely on brushes. brushes are very flat and 2d. try to use minimal brushes for a base then build with colours and filters