I've seen many popular sellers on Etsy advertise their goods on DeviantArt! It's a brilliant way of advertising as you can set up a free DeviantArt account, join a couple of groups on there and submit images of your products to the groups, where everybody in that group will receive a notification of your product (unless you turn off the notifications, which surprisingly, not many people do!). Justy make sure you keep a link the product in the description of your image on DeviantArt. Trust me, there is something for everybody on there, I wish you all the best with your Etsy shop!