When you have seen some modelling shots of a certain lady, to request that she wear the same style makeup for a meeting with you?
I've always loved that high-glam look (some might say "slutty") and would love to have the experience just once.
And no, I didn't get a date to my prom, so I didn't go...
(If I had know her, I would have asked Lass...hehe)

I don't think it's out of line at all to ask for a certain style of make-up/dress/lingerie etc.  I like it if guys have preference that they request I wear a certain outfit or dress in a particular style (formal, casual, glamorous etc)

Worth bearing in mind, though, that if the lady's make up was done by a professional make-up artist for the shoot, she might not actually be able to replicate that look herself.

to ask them to get all "glammed out" ... that "Big Blondage" look i mean ... it's part of the whole fantasy package with PSEs really ... those who comply obviously please their fans and some of the ladies go through great deal of effort (often an hour or so of preparation between appointments)

with my GFEs i expect a certain fashionable decorum (but nothing over-the-top certainly) ... heck, my ATF could've just gotten out of bed with slacks on, wearing a comfy tank-top, white socks, no-makeup, that goofy just-woke-up and puffed-up look on her beautiful face and that sultry "burn" behind her eyes ... mmmmmm ....

[Homer-esque] 'goofy just-woke-up puffed-up look' ... [drool]

NOT at all, Danny!

It's YOUR money ... it's YOUR session ... feel free to request anything your heart desires!  If she can't or won't do what you ask [for some reason VERY few providers own clown suits these days] she can very easily let you know and maybe discuss other options with you.