My opinion. Leave a positive but say like you have here. She is not the girl in the photo's.
One thing I have been told by girls who use fake photos is they do it so as to ensure their boyfriend won't know who they are as even if they hide their faces, from their bodies alone their boyfriend will twig on instantly it's them (which is true, I have seen body shots of girls I have simply booked and knew immediately it was them just from their skin tones and breast shapes etc).
It annoys me like hell when WGs do it, especially attractive ones who do not need to do it as it is massive deception on their part. But the above is the reason I have been told a couple of times why they do it.
The punt itself was good from what you say, its just this one problem. Its not like its a minger tricking you by putting attractive photos - which is way worse in my eyes.