For me, I've always thought that my smile is a bit awkward, as I sometimes smile bigger with the left side of my mouth.
Men have told me that it's cute and child-like.
Also, the fat that I still haven't lost - Gentlemen have told me that it helps lend to a softer and more feminine figure on me. Not gonna argue with that one
Last but not least, my use of the English language. I LOVE grammar/spelling for some reason, and have no problem speaking well/proper, but I will also intentionally butcher it.
I had a client laughing at me, just the other day, telling me that I sounded like a cross between a university professor (yeah, right) and a hillbilly.  
While I was somewhat embarrassed about it, he found it "comforting to know that [you're smart but also quite the little clown]".

what's not to like. I think a woman appreciates when you focus on something she's self-conscious about and do so with the greatest pleasure...  
Regardless of her self consciousness, regardless of the body part ... or perhaps, as you mention, a language concern.  
I also enjoy the challenge of communicating with nothing but our actions and reactions doing the talking. Hottt

she was 5' 3" and her weight would bounce between about 95-98lbs. She was so small at 95 lbs that even size zero was too large for her and she would have to shop in the "girls" section.

Sometimes I’m too humble about my perfection.

Something I apparently need to learn.

... so I'm replying to the question in the subject line.  I find most providers very self-conscious about their faces, wrt having makeup applied just-so.  But I think clean, natural skin is very sexy and attractive.  The less make-up, the better.

I almost NEVER leave the house/meet someone (especially a client) without makeup, but even as a trans woman, I've been lucky enough that I don't necessarily need it. And even though I don't pack it on,  I've gotten the typical, "Are you sick?" question, when I wasn't wearing any.
If I want to go "without makeup", I'll still fill my brows a little, and put on a little mascara. Just enough to make my eyes pop.

but now I'm perfect!   8o)

Supposedly, freckles are a blemish, but they drive me nuts, especially if on the breasts.

... but now I can't remember them.

There are *so* many quirky little things that women are often self-conscious about, that I (and I'll bet I'm not alone) find charming.  Things like the lopsided smile you mention, or an accent. A tooth that goes a little wayward, maybe.

I second the small breasts (a nice soft handful is really all that I need) and the "tooth that goes a little wayward."  

Im self-conscious about wearing my eyeglasses during a date. I have horrible vision and after losing my contacts(clear) and breaking the frames on my glasses i have often met someone not being able to really see and fumbling around in a blurry haze lol because i dont think i look good with glasses on.

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I am a sucker for

I don't find self-consciousness attractive.

A regular lady that I see was lamenting the growth of her FUPA.  
I really enjoy holding her there while I DATY.  
Aside from her magnificent c cups, this little  FUPA would be the only extra on a lithe athletes body.

and while I don't think you are wearing glasses in any of them, I can't imagine that you wouldn't look good in them.

I knew i liked you 💋

your vagina..

Smile and laugh lines!

I, for some reason, find pointy and elven ears irresistible. The girls (who I have met) with such ears always wore their hair long which basically told me that they would rather hide them.

I concur Rasha