My friend told me to comment on these. However, I'm sure he's going to regret it. Anyhow, the styles you have going on here are "cool" in a way, but none of them truly match the theme you want. For instance, look at "the gardener." Sure it's pretty cool, but the theme doesn't match at all. You have black and green mixed together, and unless you want to make a Holloween signature for someone, pick different colors. All of your sigantures are what you might call... dark. You seem obsessed with black. You also seem obsessed with the "cubism" effect too. Try screwing around with GIMP. Have some fun with the other effects. Maybe you can look up tutorials, or try the "signature school" link in my signature. I see a lot of potential in you though.
To Frag Man: Thanks, I'll check out that link to Mace: Why would I use an actual alchemist? I used what I thought could be viewed as someone who had manipulated themselves through potions. to Vinny: Please Explain.