I reserve the right to display finished commissions in my portfolio (exception made if we both agree to keep the work offline for the sake of privacy, i.e. for portraits of children.) I also reserve the right to decline a commission request for any reason, and the right to adjust the price of a commission (before invoicing) if I deem it necessary.
If for any reason I cannot complete your commission after you've paid, you will receive a full refund, regardless of how much work I've already done. I will also honor any requests for a full refund of your deposit/payment at any time during the commission waiting period, as long as I have not begun any work beyond a basic sketch. I reserve the right to cancel (with full refund) any commission at any time.
I prefer to be paid by Paypal. I can also potentially take credit card payments through my website if we discuss it beforehand. Transaction fees must be covered by the commissioner.