Made to order
Ask them to draw anything
Your dog. Your street. A dragon riding a scooter. Pick a sister, tell her the topic, and she will draw it by hand.
Tap one to borrow it.
$50
one drawing, 8.5 x 11 in, about two weeks
No sketches for approval and no revisions. You are commissioning a child, which is the whole point. The full price goes to the walkathon goal.