Rules to using my stock are:
1. Your work must differentiate itself from mine (ie: don't throw a couple filters on it in Photoshop and call it yours). The only exception is to hand drawings and paintings, in this case I do not mind a full re-creation.
2. Credit me and post a comment saying you've used it with a link. If you like to use it outside of deviant art go for it, but you must contact me to show me what it's for.
3. Have fun and be creative!