Lollypop - I know! It is an age 10-12 mannikin, but a very oddly shaped one... Does the job, though!
Marniesews - there are no "rules" about ballet tutus in the same way there are for ballroom dresses, but the All England Dance Festival advises that simple is preferable to over-elaborate. I have, however, bought a piece of embroidered lace I am going to use as an overskirt/plate, and I will probably add a few flowers to the bodice centre. When I finally work out how to put the skirt bit on neatly.