right away this is what i notice: you like to sharpen, alot :/ you need to work on your depth, and lighting, you got alot of good starts here, and i think you'd really benefit from some new ideas (tuts) ^^
Yeah i agree with Daecu, smooth signature look alot better, try going very simple, but make the effects look nice yet simple.
some stuff aint bad, but i seen alot of sharpenin like what has been said earlier... keep goin tho, ur doin pretty good
they're all a bit messy. You've got some decent effects that just need to be better implemented. Anywho, they look good for someone who's just getting started, so keep it up.
Err, do tutorials... lots of tutorials. Right now you just appear to be overusing a couple of simple techniques, and the results aren't that great.