If an image has a copyright on it, are artists still allowed to use it on here for signatures because it isn't being sold for money?
Please do not flame, I honestly do not know, and would appreciate a yes or no, and why.

Thanks

Legally no.

if it is from a site like deviant art they they copyright it, you can usually just message them and ask for thier permission to use thier images if you explain your purpose, most of them are very open to it.