If you don't want criticism then don't post it. Keep it hidden or be ready people not being on a same page. If you put it on display then others can and often will give their thoughts on it, positive, negative, great points, pointless and off topic. That's just how people work, it's not your choise and they don't own you to ask permission. If you don't want response to the criticism that's fine and your choise but that how far it goes.
Also I share majority opinion, it's a fine picture of a black kid but looks absolutely nothing like Tails. Colors, testures and details, nothing gives me a hint this supposed to be tails. Only reason I know because the artist said so. I think if Tails is humanitized he makes most sense as a white as he has yellow fur and blue eyes. Someone might be able to pull off other races too if tactical about it, but this ain't it.