Single post in Questions About Site Rules 2.0

Hey, I had a question about avatar art use. I'm using a picture I found on google, but I made sure to say "it's not my art, I found it on google, give credit to whoever made it" in my forum signature and my profile, but is it still rude or against the rules to use it? I don't want to offend anyone or make the original artist mad or upset(I've had my art recolored and stolen before, I don't get that mad because to me it's a sign of flattery, but I can see why other people would get really mad about it) So, um, if someone could tell me what I should do about this I really don't want to break the rules.