I take art commissions! I generally work on a "The worst you can do is ask" basis, meaning that I'm open to drawing all sorts of stuff. I have over 9 years experience taking commissions and doing art for other people. A lot of my prices are flexible as well, meaning I'll work with you on what you'd like included and what you have in budget vs how much time I can put into the piece.
Turnarounds are generally within a few days to up to 2 or so weeks, depending on the piece. I will send you progress images at each stage- sketching, lineart, coloring, rendering, whatever is applicable, to verify that it's going how you'd like it to.
After the initial rough sketch, I usually send a Paypal invoice. I generally accept partial payment before then the rest after, however for assurance I will not continue until I have recieved some payment after the first rough sketch.