As an artist, you can never have too many ways to advertise yourself or your work.
I joined Flickr a long time ago, but that was only so I could use Mosaickr. I only just rediscovered it while I was looking at photos of some photos taken with a polaroid back on a Holga camera. I’ve decided to upload my work onto there, since it can’t really hurt. The images I upload aren’t print-quality anyway so I don’t see the harm. Seems like a pretty good way to advertise yourself.