Board Thread:General Discussion/@comment-2031854-20130219172633/@comment-3335785-20130220010640

If you're aware of where the images come from and what they can be used for within the limits of the copyright, then go ahead.

I assume this was more of a "is it possible" rather than "is this a good idea", and I believe it's possible. I don't know what happens to the file URL if someone updates the image, although it'll certainly change if the file is moved.