I am not strict about the use of my stock, but I do have terms.
My work/photos are not to be claimed for your own-ever.
nevereverever.
That's stealing. And you go to hell for stealing.
Otherwise,
You can use it for ANY cause on deviantart (besides redistributing it)
BUT I prefer being notifyed first.
If it is being used off deviantart (howrse, horseland, ponybox, etc.) I'd like you to credit me on the graphic/photo.
Thanks!