1. Charge for fabric and supplies
2 . Charge by the hour with regard yo degree of work detail..minimum wage if "c" quality work, a dollar an hour more for " b" quality work, another dollar an hour for " a" quality work
3. Extra charge on top for degree of pizazz.
Realize you'll probably be rarely paid what it's worth.
4 . The local market will dictate..if no one gets more than $50 for any quilt..you get the point.
The market is often quirky...I've seen marvelous designer quilts,hand done..go for a couple off hundred bucks,along side one of my utility quilts go for the same price ( the buyer really liked deer)