Lighting is very nice, especially all the detail in the shadows and highlights and an impressive pose by the model. easy 3 if you ask me.

Some comments if I can "critique" some things.

the bottom line of the backdrop isn't horizontal. Not a huge thing, but still, it's there. perhaps an artistic choice.

Personally not a fan of her foot going beyond the backdrop/background. But that's more personal preference.

I find the highlight in the eye to be a little bit strong.

While I don't mind the hair, when I think of ballerina's I think very neat and precise hair, tight buns, braids, that sort of thing. Again, could be an artistic choice not to do that.

Personally I would prefer it without the ring on her finger and perhaps editing out the tattoo. Just to clean it up a little. It could also just be that they stand out more, as that arm is lit up more than the rest of the model. Perhaps a little dodging and burning to balance it out and darken her right arm a little.

I also agree with Steven about the foot above the backdrop and the horizontal line. Other than that I absolutely love this photo!