Lots of possibilities. Sell a tattoo book. Have visitors vote on tattoo designs. Make sure to include a way of allowing them to share them in any way they want. Facebook integration. Combine the most popular tattoos and create a book out of them. Integrate a tshirt store, lots of people might like designs but wouldn't want a tat of it. Stickers, posters.
Whatever you decide to do, focus on user interactivity. Monetization can come easily when you engage with what your visitors are passionate about. Keep in mind that people that are visiting your site are likely in research mode and are not necessarily going to go out and buy something out of impulse. Give them a good reason to come back and tell their friends.
Whatever you decide to do, focus on user interactivity. Monetization can come easily when you engage with what your visitors are passionate about. Keep in mind that people that are visiting your site are likely in research mode and are not necessarily going to go out and buy something out of impulse. Give them a good reason to come back and tell their friends.