I love this shot, its really nice, i love the eyes and the concept of mimicking the snake tongue with her own.
I have not written a critique before and who am i really to judge, my work is not this good.. however i do have an Arts degree and so i hope that's ok for you.
ill start with the cons so that its a sweeter ending,
Cons: most of the frame is taken with the shoulder, half of this i think would have been enough, its a big block of bland image that can deviate from the rest of the image.
i`m note sure if its Photoshop work or make-up but something about the nose and the bridge of the nose look off, almost placed on the image but this could just be me.
i think this would have looked much better in a Medium Format shape rather than 35mm (or 7x5 as it is)
Pros: its a wonderful use of colour and shadow, i love the red lip line into the cheek, eyes are star filled and i love them. Great set-up of symmetry making her look like the snake, scales, eye shape and colour. good pose.
i think its really good and i hope to see more like it soon.