Nice concept =) The guy looks great there but a smooth vector of the monster?beast? should have complemented it.
the wallpaper is rather empty on either sides but still - great work! =)

Glad that my walls inspired you

Vector is done nicely and shadow is placed nicely too, that part looks really good ^^
But text is a downside here I suppose that placing your sig at bottom just as it's usually done would work better and make it a bit better.
As for main text, I'm not really sureaout that font and placement... but I find it hard to give you some suggestion since I haven't watched Persona (I have what's out of it, but didn't had time )

Still, even through I didn't saw it, I can suspect that choice of character and shadow are not a concidence and that style fits to them.

btw, funny thing that actually I found that wall on DA which I don't really use >.> I was curious what will happen if I'll type Deto15 in searchbox XD