I think this would look better without the white background. The bright white drowns out the mostly-dark design, making it hard to make out, and a solid-coloured background doesn't add anything of value to this piece. It also makes hard to appreciate the piece as a whole, because of the tight crop. Make it transparent instead, that'll make it look better.
Ups. This backgaund is my mistake
But i can't change preview
Oh. I can :D