That's all good guys, but if you are still altering someones original work from there post, then proper edicate is to ask them before posting your revision. If he likes it ...great, but if he doesn't ...that's not so good. Sometimes issues can arise when fans alter other fans work & they do not like the representation or vision, even on something as simple as added colors. I've seen this happen before.
It's just a helpful reminder that things should be cleared with the artists before posting it to the public, that's all.