Pretty nice. One hint, though. A major rule of typography: never put type over an image unless you can fit it all in an area with a flat colour. The Batman one with all the blue, for example, works well, the others are nigh unreadable. To fix that, put a dark coloured rectangle on a layer beneath the text. Also, I'm not a fan of the typeface, but considering it's Batman, it works.
Keep at it, and don't be afraid to read Graphic Design-related books if you'd like to make this sort of thing more than a hobby.
