Commissions, anyone?

I'd like to start taking commissions. This is my first time, so I'll try my best to detail my requirements.

1) How many per month?
Let's start with three commissions a month. If things work out, I can increase my commission slots later on, assuming there is a demand.

2) How much?
It varies. For a simple portrait/full figure with little to no background: US$12. Add another $5 for a second character. For a portrait/full figure in a scene, i.e. full background: US$22 - $40 depending on how intricate the background is. Payment is through PayPal: 50 percent to be paid first and the rest after I email the art.

3) What is on the menu?
a) Digital painting only. I don't know how to do photo manipulations or matte paintings. I can do traditional pencil sketches, but mailing it will be a pain, so no.
b) Adult people. Non-mature content. No violent, racist or insulting content. I can do sensual but to be safe, think PG-13.
c) Only famous or fictional people/OCs. I don't feel comfortable doing a portrait of a client, client's friends or family.
d) No animals as the main subject (part of background is OK).
e) No landscapes or cityscapes as the main subject (part of background is OK).

4) What styles?
I prefer realism, but I am willing to do graphic novel/comic book and art nouveau. No manga, anime or chibis.

I am a self-taught artist, so please don't hold me to a crazy-high standard. But I promise to do my best work, always.

If interested, you can drop me a note and tell me what you want in the painting. I reserve the right to refuse requests at my discretion. Thanks.