There are only two things you need to master to be a successful artist:
1. Creating
remarkably good art.
2. Finding the people who love your art and
sharing it with them.
Unfortunately, many people spend their entire careers learning to be great at
either the first thing
or the second thing. You’ve got to master
both.*
*(Some artists focus on number one and partner with a gallery or spouse who excels at the second item. That combination works too since both items are mastered by the combined team.)
via clintwatson.net
That's an excellent question, and I think one that confuses many artists. There are many types of audiences for art, and many types of art... finding a match between your art and an audience is what it takes.
I started out doing outdoor art shows in New England states. I sold a lot of paintings, grew a mailing list, and was approached by 3 galleries while doing those shows. I also participated in fundraisers where wealthy people attended, but I made sure I had a reserve price on my work (reasonable) and got a decent percentage of the sale... usually 40 percent. Most often I offered portrait commissions, and the folks who bought those were not art collectors.
Well.. I made them into art collectors ;-) Finding your audience on your own can be difficult, but not at all impossible.