Ami wins.
Why does she win?
She wins because her signature is brilliant (no pun intended). It is simple, with a well chosen stock. The bright complexion off the face of the character is well done. The stars from the stock adds to the design of the actual signature. It looks like shes looking into the sun with the wind blowing off her golden complexion. The lettering is perfect. It is sharp, percise, and well chosen.
Why do I not like the other contestants?
Versace's signature is abstract, intelligent, and original. However, the lettering is off, it is kind of dull and unclear. It hurts my eyes after seeing the lettering after awhile. Its like seeing if fire is hot after burning myself once.
Walsh - I like your simple design, your render + text. It is simple, and good since you seem to be new with PS. Its a great start, and I would like to crown you the winner but you see, well... I see no text. Its plain. Too plain.
Blueberry - Its great! I love how the light shines off her body, giving her a nice tan. Then theres the abstract markings on her, which develops the texture of her skin. However, like Versace's, the texting is a bit off, it doesn't really "mix" with the actual signature, I also do not understand what "Deception" has to do with the signature? Because she really doesn't have tanned skin? She's actually a ho? What? A decepticon? Well, other than that, its a great piece of work.
Kittie - Same as Blueberry. I don't get what you mean by chapter 13. Are you reading up to there in a book? The RO chapters? If it is the RO chapters, then what does that have to do with a girl lying on her back? However, I do really like golden look of her and how she stares off into the light. A great stock image!
Edit:
You are contradicting yourself sir.