I’d be pissed too. They didn’t just change her skin tone, they completely took her out of the photo. For models who are sometimes paid in exposure, this is like yanking that pay away from her. Whatever photoshop is done, she needs to at least look like it’s her for her to be able to get the benefits from doing the work.
But even models who are paid money, there should be laws against making them look like someone completely different, in terms of the brand that they work for.
And that designer is a pos for sharing that photo, even if a fan did send it to him as “fan art”. Beyond the face change being in bad taste, he’s a professional, so he should be promoting the actual model who walked for him.