first 3 orders are free
the heads are 100 credits for one day jobs and 150 credits for difficult, specialized heads.
The Signatures are 100 creds-150 credits as well. Of course if its a 10 minute job, it will cost 20 credits.
here are some of my sigs and heads.







EDIT: Ps. check my thread "My Favorite Drawings Come and See =]" in General Art, it shows some of my drawings and itl tell u that i have a little bit of talent