Facebook, twitter, G+, Pinterest, stumble, tumblr plus join in the discussions on other forums that relate to the subject of your art - that's just a start :)
Read the first five articles on my Blogs page in reverse order. But make you sure you get to The 25 75 Rule For New Artist and Members of FAA. It addressed balancing marketing and inventory.
Besides the four galleries I'm in I also post my work on my facebook page, twitter and TSU. I also post my website in online art directories, such as The Palette Pages.
I've sold quite a bit of work through facebook. I post "work in progress" photos of paintings I'm working on. It's a great way to gain interest.
