Board Thread:General Discussion/@comment-38.128.134.222-20151108021229/@comment-26397825-20151108021915

You are correct in that she doesn't actually have a tail in the show, so any art of her with a tail is fan art.

It has been implied through various scenes (the first I can think of being when they were in Initiation and she points up at Ruby, who is falling towards herself and Yang) that she can hear through the ears, as they twitch just like a cat's do when they hear something. So it seems like she can in fact hear out of her cat ears, and possibly better than a human can as Yang didn't hear Ruby when she was falling, but Blake did.