I really like DeviantArt for three reasons:
1) It's a good (and free) place to store your pictures and show them to people
2)There's huge amount of amazingly talented artists and art to watch
3)There's loads of reference material (photos and illustrations) to go through
Take the drawing above for example. I wanted to try and do some traditional pencil drawing stuff and went browsing through the photos in DA. I stumbled across this photo and though to myself 'she's an elf' (not the high and noble Tolkien kind, but wild and pointy-eared Charles Vess -styled creature)
So I drew her...