According to a Mashable article titled, Can there be an Etsy for Fine Art?,
the newest fine art sales site is CUREEO — and like etsy, founded and run by women.
When you sign up to the CUREEO site there is a checkbox option if you are an artist and want to sell. A drop down form appears and at the bottom there is a required $5. processing fee payment.
Whether this opportunity is right for you or not, Artist Marketing Resources offers about one thousand more art sales sites in our PDF list 900+ Places to Sell your Art http://artistmarketingresources.webs.com/apps/webstore/products/show/2969611