Well, I played safe with the first pic I posted, but the "violence" tag is probably not needed. On the whole, the tags here are pretty sensible. There's another site which has a category of SF, Fantasy, and Horror; that's a bad category because it puts "Star Trek" in the same category as "Night of the Living Dead". But, yeah, if the mods apply a tag, it would be polite if they told you. They can automatically email you if somebody replies to a forum post. It doesn't seem difficult to fire off an email if somebody changes a tag on a piece of your art.