Deviantart is very much the most obvious choice for artwork, though you have to put up with some nasty people and there's the fear that someone might stole your artwork and claim it's his. Still, not a bad choice.
You can also use Tumblr since the tagging allows your works to have better exposure than in Deviantart and you can just have a simple art blog there and it isn't necesary to be involved that much in the site if you don't want to. Besides, if you know your basic HTML coding or HTML in general, you can customize the theme of your blog for your liking, either the oficial ones, the ones created by users or websites outside Tumblr or even create your own page.