It's looking good. I really like the bullet. And the hole it is making is looking good. As you said, the background is a bit dull .. Or at least it's dull in a bad way. I know this is... way down, but I think the queen is a bit to dark, you can't really see what she is wielding and maybe queen of spades ? It's looking a bit evil, but maybe there's a reason for that?
You've said the rest yourself ..
Keep it up!