I've had a lot of success with Pinterest too.
Here is how I recommend you take on Pinterest.
Create 5-10 quality boards, each with their own topic which is related to the kind of art you create.
Make sure you fill out your profile in full. With your website, make sure you have Rich Pins activated (google it).
You then want to get your first 200 or so followers (more on why later). You can do this by inviting your facebook and instagram followers, family and friends to your board. If that doesn't make 200 people, there are Facebook groups (search "Pinterest Group Boards" in Facebook) where people share their Pinterest profile - you can get a lot of followers that way.
Once you have 200 or so people you will want to start applying to group boards related to your artwork. There are heaps of great group boards out there. To find them just type in Pinterest search "[topic] group board". Obviously, change [topic] to be what topic you want the group board to be about. Eg art, drawing, craft, photography, DIY.
Once you have found a group board, you will need to find the owner. This is the first person listed in the contributors list. Follower the group board owner and sent them a message (usually by commenting on a pin of theirs) asking for permission to contribute.
Once you have permission to contribute, you now have access to the group board (and the thousands of followers). When you post something from your site on these boards it has potential to reach 100s of 1000s of people on these group boards (instead of just your initial followers).
The next step is to use regularly pin to these boards. I use Tailwind. I don't go crazy, but it gives me consistant traffic. I have a friend who uses Pinterest for their health blog and they get 1000+ a visitors a day from pinterest using the above strategy.
If you have an etsy store, behance account or other place you make money from your art, you can pin the image from there. This means people will be redirected to your store if they click on your pin.
Hope that helps.
Also, tumblr is another platform (though I don't have much experience).
I would also look up were to sell art online. Set up shop on all of these and monitor which one makes the most sales for you.