Considering that particular image is of a transwoman in a gay pride parade, I would think it is fairly appropriate for a section on "Transgender in contrast with sexual orientation," as it does a good job at illustrating the often complicated relationship between the two concepts. An image of a transman would certainly be appropriate for balance, though the key is that any images shouldn't be of a random transgendered person, but should somehow illustrate and enhance the text they accompany. ✽