I do sketches and sketch pages. I generally draw in hour long increments, but you budget more than that. DM to order.
$50 Sketch - I draw a 1-2 character sketch that is either cleaned up or has extra detail. $50 Sketch page - Quality varies a some. I usually draw fast low detail things, which is great to explore ideas. Sometimes it's a little higher quality, but either way I try to keep it in budgeted time.