The first one is fantastic in my opinion. I think you just need to add some sort of text so i know the meaning behind it. The heart is a little too big, too...but I'm just going on the assumption that you're some post indie screamo band. Maybe even try a broken heart. The rest I'm not too keen on, the third would be my next favourite, though.. the skull is really cool looking. I like how it kinda jumps off the screen. Overall a good job.