Selling my work

Spent yesterday at the Arlington Open Market with my wife in a booth we shared for our art and her jewelry. This is a once a month event and is usually followed by a night of music and food on the square. Some shows are better than others as far as how much we sell. My wife tends to sell more of her floral paintings that are unusual in that she uses stucco spread over canvas and then uses a tool to sketch a flower like a daisy and then paints with bright acrylic paint. My work tends to be more representative in nature leaning toward realism. Sometimes I may sell one or two paintings but it is always frustrating to not sell more. I will get commissions sometimes which are stressful at times because you are trying to fit a mold that someone has in mind instead of selling something that is already complete. We always get very good comments but would like to be more successful. I try to read all I can and enjoy forums like WetCanvas to get feedback and ideas. Anyone have comments on the best way to show and sell your artwork?