There has been a recent issue with an artist who had their art posted here without his permission. He has had the image removed, and I have communicated with him and hopefully repaired the damaged relationship.
This is a learning experience. We as a community should endeavor to correctly source and attribute our art. Much of it is public domain, but some is not, and we need to make effort to use art that we have permission from the artists to use.
This is a legally gray area due to the ambiguity of Fair Use law, but it should be something we should consider to be an ethical responsibility. I will begin working my way through the material I have uploaded to correctly attribute them.
I encourage everyone else to do the same.
Correct attribution should include the copyright status and both credit and link to the artist.