Besides unattractive facial, bad manner, bad attitude, odor, bad breath, bad dress...
What physical features of the girl will turn you off?
When I was searching for my dates, I often  avoid girl's photos w/ bat-wings arms or muscular legs even they have beautiful faces, or outstanding performance.  
What are your selection criteria?

girls who are slender, I'm pretty chill about differences in people's looks.  Service is king for me, with the following qualifications. . . . . I avoid girls who are too fat, too old, or too ugly.  However, when it comes to "too old," that's a relative term to my own age.  I know there are guys here who think the age group I prefer are too old, but some of the best top-tier girls out there are between 33-45, and as long as they are trim and fit, and not fat and saggy, I will see them for the superior service.  Guys in their 20's are going to reject most of these girls as being too old, and I respect that.  If you walk into a situation where the girl is closer to your mom's age than your own, it can be a real turn-off.  Lol

Unless it's in the "manly" territory, generally girls with such features can squat well and have endurance to ride in acg for a while. Which is a turn on for me.  

 
It obviously also depends on length of their legs as it's a lot easier to acg squat for shorter leg girls.

Certainly I won't let almost any *reasonable* physical feature prevent me from seeing a girl with an outstanding performance.

 

*example of unreasonable physical featurez = being post-op/cd/trans/whatever. Visible facial hair on face, hair on armpits. Excessive acne/moles/rash. Etc.

 
I'm also not a fan of super excessive metal ie piercings or body modifications/mutilations.

Luckily not a big problem with K-girls, but excessive tattoos are a turn off.  Why ruin a piece of art already?

Oh and cankles, definitely cankles.

ANY bad smell emanating from ANY orifice is a major turn off from me.  Instant bone crusher.

Naturally includes legs, pits, ass, crotch, upper lip, but also including forearms.

I’m also turned off by nipple and clit piercings. I like sucking on those and don’t need to have a piercing in the way (which are sanitized after every client along with their body, I’m sure).

came to this hobby, but after seeing a few Kgirls who were slender, lean and tight, with good muscle-definition, who had several tattoos,  I changed my mind.  Now if they are overweight or kind of soft and spongey, I still don't like them.  They only look good to me on muscular girls.  

a pretty low bar in my opinion.  If she has ANY hair in anyplace other than her head, eyebrows and eyelashes, she's a pass for me.   I totally agree about piercings.  I will tolerate ears and belly-button, but that's it.