Once you arrive at Crystal Greene’s ultrachic facial studio on the Upper East Side, prepare to be put into a trance with her zen facial sculpting–meets–advanced skin technology technique. “I enjoy giving facial massages and how stimulating the skin can have such a profound effect on the nervous system,” the New York–born and –raised esthetician says. “The best compliment is when clients often say, ‘Wow, I’ve never experienced anything like that before.’ Skin health...