First of all, stretching lineart like that looks ugly, it gets all messed up like you can see. Try to keep the image of the band playing lineart at original size?

Dont try to force alot of colours into it. The lineart thing is black, maybe you should pick a dark colour as background with a blurred enlarged picture of the lineart and maybe give the lineart on the foreground (which is not stretched out) a soft glow around it. But I dont know psp so I dont know the possibilities with it.

about the url, I dont know how to do that.