Darth Venal said:
I use deviantart, but I'm not putting my artwork anywhere at full res, not a chance. I don't mind sending to people privately sometimes when I know them a while, but I can't publish anything for free, whether it's inspired by other material or totally original.
So legally (or contractually), no one could use your mattes unless you were getting paid? Man, that sucks. Guess it comes with the "job in the industry" territory.