Has anyone noticed a correlation between the pictures SB's choose to post on their bios versus any other characteristics like narcissism or GPS?
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Some chicks have a few hasty snaps such as thru the latrine mirror, or obvious arm length selfie. Others have posed snaps apparently taken by someone else, often in fancy or exotic locales.  
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Is it a reliable key to their future behavior? High maintenance or low?

No.. I’ve seen very amateurish pics or some unrevealing ones from gals seeking very high allowances.
Probably those with pro shots too but I wouldn’t make a direct correlation

Professional looking poses tend to mean an experienced SB.

Amateur college pics means it is either a fake or the body has changed a lot.

As Scary said, I don't think there is a direct correlation. But I do think pics can be additional evidence one way or the other.   A profile with mostly/only exotic shots of her in upscale locations (like high-end bars/restaurants, or leaning on a Lambo or Ferrari) wearing designer clothes and holding a glass of champagne, are generally a tip off that's she either an IG model catfish, or she wants to project the lifestyle she expects (demands?) Daddy will provide. But it's not impossible for a 20-ish hottie to have a pic in front of the Louvre from her2019 family vacation.  

 
And a profile with lots of apartment bathroom or bedroom selfies - where you can see clutter in the background or her dog's tail on the bed, don't always mean she's trailer trash poor and desperate.  Those shots could just be the pics on her phone when she spontaneously decided to create a profile, or they could have been taken by her pimp.  

 
So context is important. There are some general themes that I do see:  

 
1. Lots of (or all) pics in lingerie, swim suits, or see through tops could mean she's down for BCD soon - if the allowance is right.
2. High angles + face close ups without any good full body pics = fat. No judgement here. Some SD's are chubby chasers... not! Please don't encourage POT's to expect a big allowance BEFORE they sweat off those last 20, 30, 60? pounds!  
3. Pics with a girlfriend, or group shots from a party or work, but no/few single person shots could mean she is nervous about being recognized, or she is a catfish. Same with pics with obscured faces.  
4.  Low resolution, grainy pics could mean the pic is cropped to exclude other people (like her BF?) or some landmark. or it could mean she has shitty photographic skills. Or it could me she is not confident about her looks.  
5. In my experience, too few is bad, and too many is also bad.  Less than 3 or more than 8-10 are yellow flags to me.  Especially with the Asian POT profiles that only have a professional-looking headshot and there is little in the profile text to provide context.  

 
Life is good

 
The Cat

.. who posted a photo of part of her chest and neck (in a sweater), so you couldn't really see her shape.. who wanted 750 ppm. Another with a partial body/face pic seeking 600 ppm. I think it's possible to get good quality pics on the phone now so not a lot of excuses for poor images

I'd not read too much into swimsuit pics.  That's normal beach wear.  However other scanty clothing might mean more.

Not really in the theme of tells, but I hate when they post dozens of face pics ... all from the same fucking angle.