I agree with Ed, no SM works well... and they all work great. If all you are going to do is post your art most likely you will see little to no return regardless of the platform. If you take the time to learn and keep up with the techniques that increase your reach on any platform you will do much better. However that takes a lot of energy and time, and is something I really dislike doing which is why I don't sell much. My only SM is Twitter and I don't really work it, I mainly use it because the bots like Twitter and tweets do well in Google search
That said I sell far more originals than prints just by uploading to ebay and Etsy, (they get far more traffic than FAA), . I have sold prints through drop shipping on Etsy and there are artists that do well with that but I stopped doing it because I wasn't selling enough to be worth the hassle, and also the fact that I have no control over production or shipping made me anxious, and in fact my last drop ship sale on Etsy was packaged poorly and got damaged and dealing with that was quite stressful. I'm on POD so I don't have to deal with that stress, so I stopped drop shipping.