Not blogs, strictly speaking, but forums? This one, PlanetFigure, for figure painting; FineScale Model, which is affiliated with the magazine; Maschinen Krueger, Bryan Krueger's Maschinen Krieger forum; Figure-Mad Forum, a German figure painting forum; HyperScale, though caution is needed with that one: there is a lot of good info on it, and there are members who are published authors, but there are also a lot of crabby, grouchy people on it.
I also belong to a toy soldier collector's forum, the Treefrog Treasures Toy Soldier forum (named for the founder's gift shop; she started selling collector's figures, then started the forum).