Avatar: 8/10. I like the image itself, with the way Eighteen's hair is swirling. The colour is dimmed in a nice way and the outline bold gives it a nice effect.
First Sig: 7/10. How could I not love Aerith

The dark rose red background contrasts nicely with her image, although I'm not sure if the blurring outline was done as a purposeful affect or not.
Second Sig: 6/10. It wasn't bad, but the colouring and affect didn't work that well.
Please note that I don't know diddly-squat about using PhotoShop beyond cropping, so I can't fully appreciate the amount of work that probably went into people making their own designs.