You could always check out
Picarto.Tv since it's a livestream service dedicated to art.
Artists like
Shilin and
Artgerm also advertise when they livestream, either on their Facebook pages or Tumblr if they have it.
I livestream as well though I'm not sure if it's the sort of style you're interested in ^^; I tend to advertise in my Sketchlings art thread but with that closing down soon I'll probably be linking off my
Tumblr.