After having looked at some pictures on this forum about sexing panthers, I would have to say female. On the last picture, and the second in the first post, I can see what would look like "the dent". I am by all means no expert on this matter, but that would be what I think
I would like to link to this particular post: https://www.chameleonforums.com/still-trying-figure-out-if-male-female-111067/#post1006195
The image is very good.. I also remember there being a topic with the same picture in it, but I can't remember where it was....