typically i look thru the various picture galleries on a provider’s personal site i only pay attention to the fashion/lingerie. however one provider has pics in her summer 2024 gallery with dark hair in contrast to the other galleries where her hair is blonde. she looks like a different woman…any chance the provider is wearing a wig with the darker hair? is there anyway i can request the darker hair as a special request for a session? anyone have any experience with this?

Couldn’t hurt to ask.

Many blonds are not really blond

I've seen plenty of picture galleries that show a lady with different hair color in different pictures. Apparently our own Veronica Turbay is one of them - seems like she's a blonde now.  

i should have worded things differently. i want to see this particular provider but only if her hair is black. is there anyway to persuade her to change her hair back to black so that i can book a session?

"Persuade her." ??? Oh please..... short of bending her arm backward at the elbow, why don't you ask her politely about your preference?  If it is black go so her.  If she doesn't honor your request to alter it to black, move on....  

As always, money talks Janet. Full color at a salon is usually in the $150 range. Once you book and pay for the hair appointment I am sure she will be delighted to book a session with you.

Interestingly perhaps, I tend to be influenced by first impressions rather than the color itself. I kind of get accustomed to whatever her hair color is the first time I see her photos / ads. Even if she still looks beautiful with nicely coiffed hair but a "new" color (to me), my reaction is some sort of mix of (a) She looks familiar but the hair looks different, maybe a little bit 'off.' ... Oh! She used to be a different color! (b) Oh wow! She was beautiful with [color] hair and now she looks different (to me). And those kinds of variations. I can think of some cases that even involved favorable "first impressions" with blue or orange or pink hair (or highlights) later replaced by a more standard color.
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I have a similar reaction to first impressions based on hair length. She can go from beautiful (long / short) hair to beautiful (short / long) hair but I usually prefer the first look I had to the modified form.
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Is there some sort of psychological term for that? Like "imprinting" in babies that become attached to the first thing they see after birth? (See tiktoks and youtubes of baby ducklings following cats or dogs or people that they think are their mother.)
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I would like to know if gents like multiple looks?  And multiple galleries, with, say, seasonal or thematic differences?

Ask her how much it would cost to see her with black hair. Be specific whether wigs are acceptable or not. If she has to get her hair done, be prepared to pay for it in advance. And don’t be surprised if she charges you for the change to black hair and then the return to the original color.

Welcome Jenny, as I don't remember seeing you post here before. To answer you, yes, I like different looks i.e. professional pics and selfies, pics with hair up & hair down, all dolled up and a casual look. I love when a woman gives me a range of different looks. The one thing I don't like is when I have no idea what the girl would look like when she opens the door, so let me explain.
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Some women show pics of long hair, mixed in with very short, black hair mixed in with blonde, etc. So in those cases, I literally have no clue with whom I am meeting, from a physical standpoint, I will always pass on seeing her.  
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Now some will say "my current look is long blonde hair" or what have you, and that is helpful. But some woman's schtick, or niche, is that they are always changing their look dramatically, and sometimes wildly so, which of course is their right. I just need some good idea of how she will look when we meet is all.  
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I hope we see you posting here more often!

Thanks, Robert.  Yes, I'm new here and just finding my way around. I actually never thought about what you are saying, but it makes a lot of sense--  lol, us girls are used to waiting till the last minute!  

Sending a selfie might be determined on a case by case basis. And you could get bombarded with such requests which can waste a lot of time. I assume you have access to your own website or image hosting site and can easily upload a new photo, maybe with the date on it, every now and then and alert your potential callers to that.  
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Good luck!