Reading these boards and reading reviews I have come to some conclusions. Most reviewers fall into four major groups.  

You said her body pics are accurate, thus I assume you found her body attractive. You said you had a good time. Why not write about your overall experience, and give her fair scores, with the Appearance score taking her body into account also. You might choose to not mention that you found her face attractive or unattractive.  That's a very subjective thing. Did you like anything about her face?  Smile, eyes, lips, ... ?  You could mention that.  

Or maybe it's that I'd have absolutely no chance with any of the providers that I've been with, IRL.

I totally get what you are saying. One time I gave someone a 7 and my next potential date did not want to see me because she want all her reviews to be 10s or at the very least 9s. I also read somewhere re joining a private party that the providers would first screen what kind of reviews you were giving out (number wise). Their thinking is if this guy keep giving low review numbers, at the very least - he is a pain in the ass - so we do not want him around. I would suggest that if you are going to write the above review, do so eloquently in the general/juicy section about how you really feel. Most of us can read between the lines and get what your experience was like.

Well now I have nothing to say, because this is perfect

I have been very fortunate to never have had to be in a position to write a mediocre or bad review.  Research, respectful communication, proper hygiene and politeness has always put me in a position to have a great time and I've been more than willing to leave deservedly positive reviews for the providers I've seen.

My thought here is that you should not review her.  Just because you don't doesn't mean she will not be a reference for you, though you shouldn't unless you are planning to see her again.  

She deserves a minimum of a 7. If she was real nice to you and didn't rip you off, you should consider that.  Not a clock watcher and gave you the full time? Be nice to her. Too many ripoffs and B&S out there so reward her for being legit.

You can still be honest in your assessment.  You can simply talk about what you DID like in your session with the lady.  Maybe she had pretty eyes, great hair, nice teeeth or made your feel good. There are lots of ways to write about your experience with out slamming the lady.  The smart guys will be able to "read between the lines" I also find that with a little homework you should know exactly what you are getting from a provider in terms of looks as well as performance.  Do your homework!

For me, my experience, the provider's physical attributes and her personality determines how I write a review.  I try to be as honest as I can without exaggerating anything.

I have bee fortunate in my hobbying so it has been easy for me, but I have --of course-- had some experiences that were less than what I would have wanted.  I don't write those reviews: The lady may have had a bad day, she may have found me a special turn off, she may be worried about money or a sick relative etc. I recognize that a bad review can interfere with her livelihood. While I feel it is my duty to my fellow hobbyists not to give a good review to someone with whom I had a less than satisfying experience, I do not feel it is my duty to warn about someone  with whom I had such an experience  (Obviously if it was a bait and switch or a no show or the pics were fake or she was outrageous --and that has never happened to me-- I would write that review.)  
So i write the good ones and do not review the thankfully few honest efforts that just weren't good for me.

why do you consider her low end? She has reviews going back to 2013, above an 8 in looks average and charges 350hr. One guy blasted her, pretty badly. Most  scored her 8's and 9's. After reading her reviews  closely, most made no mention of her looks, Everyone said she has a great body and talked of her personality.  

Where the performance was so good that it raised the providers appearance score by one or two points.  

eading the comments, it's occurring to me that our demimonde might  actually have an easier time seeing beyond looks to the actual person than this society taken as a whole.  

...and most of us discount it somewhat when doing our research, especially since it is so subjective. What you consider unattractive, someone else might not. What is important is the general and juicy details. And you can write just what you wrote in your post, which seems like you had a good experience.  

Kind of related, I sometimes try to imagine the perspective of a provider whose profession has permitted her to see beyond the masks that men wear in public life.

So you just mean her face then?  

If she is not that attractive(subjective, but please we all know the difference) She probably knows it all ready. You won't be telling her something she doesn't already know. She makes up for it with personality and skill. I have a favorite who is "plain" but is my ATF. Why, more than anything else because of her personality.  Stress that in your review. She is also the truest GFE I have ever been with. My fav actually prefers reviews that asses her looks, personality and skills honestly. I find that many hookers don't want inflated reviews because they are then expected to live up to said reviews.  

Instead of trying to find the right adjectives, you could compare her looks to someone others might know. There was an episode of The Office where they spent the day debating whether Hilary Swank is hot. If you said she had a face like Meryl Streep, I'm sure some would think that's great and others would stay away. Just don't say she looks like Mickey Rourke in The Wrestler. That would be crossing the line.