PayPal (prepayment or payment after a sketch).
Simple - from 8$ to 24$
Middle - from 16$ to 32$
If you want more details, characters, bigger size of the result picture - from 40$ and depending of particular tasks. I work in different styles and with many themes.
Illustrations, portraits, charsheets, prints, stickers, avatars, random elements for web-pages, character designs, etc-etc.
And.