There are ballerina poses in the free stuff here.   Search  the word   Pose*   and you will come up with lots of poses.  You'll have to look through the pages through to find the ballerina ones.

Here, Daz, RDNA, and Poser Pros all have a large selection of ballet stuff.  Just go to the site and search:   Ballet    or  Ballerina   and you will come up with many options.

Also, if you go to Mystic Nights and search the same words there you will find links to sites that have free content.... Poses and textures for clothing etc.

http://mystic-nights.com/directory/index.php

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi