Is this a photo of a female cat? Sexing kittens can be tricky, I think. I have looked at a ton of images and read the books and then scratched my head and bitten my fingernails 😉 .
Below is a picture of the rear end of a female cat. Below the image are two graphics which are instructions on how to sex a cat. I have a page on this which has helped me but…I need a second opinion. You’re going to tell me I’m wrong, I can feel it! Just joking. It’s pretty obvious.