Ok, this is more about the galleries. Now, I am obviously not a professional artist, but my mother exhibits her art and I often go to Open Studios, galleries and other places. I have gathered (so far) that it is extremely hard to sell art. What I can suggest is that you don't go directly to galleries, because often people just browse with no intention to buy. You should try art festivals, studio openings (sometimes they accept artists who don't have a studio directly in the building) and other events. People go to those to buy, and since it is only a few days, you can actually meet the kind of people that are potential buyers.
I'm not sure how helpful this is, but if you are really determined to sell art, you might want to think about that.