One of the best things you can do to promote your photography and to increase your sales is to join a photo group. This can be a national or local group and it can be found both on the internet and off the internet.
I recently was in a show at an organization called Brooklyn Waterfront Artists Coalition, where I am a member. There are photographers, sculptors, and performance artists that exhibit their work and they try to sell their work at the seasonal art shows. My middle photograph (shown below) was sold at the show. The shows are great places to gather with other artists and art buyers and to "talk the arts" to them.
Photos can be grouped for exhibit by themes or not.