Photos should be recent, well lit, properly exposed and show as many attributes from as many angles as possible. But, they don't have to look like mug shots, a tasteful, even artsy presentation accomplishes the same thing.
As for the blanket "no photoshop" sorry, but a high resolution camera with bright lights see things differently than a human eye, and a photograph can be stared at for hours.
Some time in photoshop for color balance, dodging, burning, and cropping are an absolute minimum, along with noise reduction if a higher ISO is used. I'm also a sucker for black and white (cant' get more "unrealistic" than that), which is pretty much always done in photoshop.
I use photoshop to some extent on every photo I take, I try to read all the reviews of the ladies I've shot, and have yet to find one that says the photos didn't look like her, or more frequently, didn't look as good as her. And that's the goal!
More specific to the OP's post, I could just kick myself for not doing some serious ass shots of DallasBella; the last lady who posed for me. I must make amends!
In way of explanation about "dodging and burning" that is how I created the "mood" of this shot of DB, as a way to accentuate the lighting. Does it look like her? Yes, absolutely (well, she does actually look better in person). Was it "photoshopped"? Yes, probably 10 minutes worth. Would someone choose
not to see her based on this? Only if they find beauty intimidating.