What's worse? The escort who has regular photoshoots or the escort that has 1 set of photos from X years ago that never change? Admittedly a pro-photoshoot is likely to have some tarting up of the images although other escorts can do that with apps on their mobile.
I reckon new photos generates new clicks on their profiles which may translate to new or more bookings. A 1K photos hoot that generates 20 1 hour bookings will more than pay for itself whilst the same old images may get a profile ignored in the hunt for something new to see.
Also honest photos matter. As escorts get older, fatter, thinner, new hair style, new hair colour, new outfits etc. It's useful to let their clients know. Variety is the spice of life, but sometimes the tried and trusted with something new is just as good.