I'm A bit new to the GIMP concept, so have mercy XD

Frostmonke

*sigh
Don't use sprites in signatures...use renders. Also, text and background don't go together, and what you did to Palkia doesn't make the sig look more appealing.

it's okay for beginners, but it isn't that great.

like darkscyther said, it's not a good idea to use sprites (although you can get away with using them in backgrounds sometimes...), try a render. be aware though that often there WON'T be a render of what you need. i get steamed when there isn't. georgia font is also a good way to go if you can't find a good font.

Palkia is all blurry...

Text is weird...

And the backround I frown upon, make your own.

But not much worse then my first sig (with gimp, w. paint was horrible).

I'm no expert, but I think the Darkrai one was cooler.

Words sometimes mess up a sig and the palkia background good, words need a little more semi transparacy the darkrai needs some words and replace the palkia picture with something that is less blury and goes with everything else better
EDIT: replace the game sprites with and a little more depth and try mastering the art of draw the eye away from one thing and making them look at something else but your doing good so far