I have recently found a few instances of people using my imagery as stock here on DA and elsewhere.
All rights are reserved on my artwork. You may use them for inspiration or save a copy because you like the image, but please don't alter, manipulate and repost any of my work, anywhere, ever.
Save it, look at it, show it to your friends, post it on Pinterest, feature it, use it as your wallpaper, print a small version for yourself or a friend. You can even post it other places if you give me a credit somewhere. If you want to use it for something outside of DA, just send me a note. As long as it's not being used commercially, and if it's credited and unaltered, I'll probably say yes.
Just don't alter it and/or claim it as your own. Don't do that with anyone's artwork unless they offer it to you for that exact purpose.