Why is she showing her ass though? I'm not too familiar with humiliation play.
Ugly waifish (small and thin) Doms dont really keep clients unless they have exclusive equipment (which then raises their prices a lot). Subs like their Doms exotic, feminine, and "Amazonian" - as in curves, which she was showcasing in the picture. Granted her face is a bit rough but she has the ability to handle most subs like they are weightless. A lot of subs like that and will pay well for it, and its very hard to find a woman that can flip a guy that easily that doesnt look masculine herself (hella muscles, hard jaw, etc.)
If she takes some Dominatrix classes, gets a dungeon, and learns English she could easily charge $1000 an hour and still be over booked. Women of her size that do this are very few and far between.