1) Notify the use. You must note me giving me the link to your deviation, or writing a comment on the stock used, so I can fav.
2) Give credit to me when using it. Write :iconsempiterna-stock: or :devsempiterna-stock: in your deviation's description, and you can also put a link to the original stock deviation used if you want.
3) Consult me if you want to make use of the stock outside of dA and for commercial purposes.
4) Don't use it for pornographic, violent, or any other denigrating works (note me if you have any doubt)
5) For digital artists: Minor changes are not allowed. Be CREATIVE, please. Don't you just crop, change the color or turn in into B&W! add a background at least! Otherwise, you can refrain from using my stock.
6) To traditional artists: Of course you may use my stock as reference in your art, you don't need to ask me permission. Just remember the first 4 rules above.
7) Have fun!