You badly need to work on your text, but that's OK every new designer sucks at text lol :P
Zelda/Link Signature:
The render of Link is positioned absolutely perfectly, which makes the design as good as it is. The background is pretty damn good, although I think you have used the same one of both of those sigs, correct me if I'm wrong.
Worms:
I like the effect you used on the render in this one, but it wasn't meant to be, the render doesn't go well with the background and isn't blended :P
Try not using renders, sometimes it can get you alot further when you're new.