I agree with Jeff. It is pretty easy since you have already identified that you have two sets of customers (actually, I think you have "users" and "customers").

Think of the needs or painpoints of your customers and how you are going to help them solve it.

If you are really targeting small brands jewelry and accessories, and helping *them* reach female buyers, identify how you are different from sites like Pinterest of Etsy, which is doing what you are aiming to do.

What sets you apart and what service are you offering that will justify the fee/payment/goats that these shop owners will give you in return for what they cannot do on their own.