So I decided to add one more figure, to make the original girl feel like she's stuck in the middle of a crowd. I figure the two outside girls will be friends, having some sort of conversation, paying little attention to the girl whose broom they hitched a ride on.
At this point I really don't like the way the two friends are posed, but the idea of sandwiching the first girl is working.
So now I'll refer to these girls by their position on the broom, from left to right, girl 1, 2, and 3.
Girl 1 should have a way more suggestive pose, and more relaxed at the same time.
Girl 3 lost all her appeal, and seems tense. She needs to relax.
Awesome! Love the tutorial. Here's some suggestions: Girl 2 should be trying to look around girl 1. And girl 3 should have her arms on girl 2's waist. I liked the cat in front idea. It gave it a nice shape - things get smaller towards the front.
your drawing style rocks, man.