I think you're way too low! Even if you buy your supplies at wholesale, you're not going to make a darn thing per hour with those prices.
Pretty much HALF of your price would cover the cost to edge to edge quilt each size. Is the other half enough to cover fabric, thread, batting, wear and tear on your equipment, equipment cost? No... and you haven't even paid yourself yet.
Figure out what you need to make a profit, then find the MARKET for your price range.