Wow, the composition of the picture is absolutely great. You've managed to make a background that is as interesting and worthy of attention as the lady herself, without blurring the whole or drawing attention from her. The dynamics look great, and the costume design and colouring are SO good! I love flying hair!
There's only one thing to remark on, and that's the panty-shot: not the panty-shot itself, but the anatomy it reveals. There is no physical possibility for anyone to hold the "I need to pee"-pose AND have a gap between your thighs that shows the back of your skirt. I know it's standard to grab the kitchen knife and slice off the inside part of women's thighs, and sometimes men's... I know your work doesn't usually have this problem... and most of the time I can look past this in pictures... But you have to agree that for a pose like this one, nothing short of a worm hole or straying pubic hair can explain the dark section between her thighs.
Well considering the skirt is black I would only assume that the dark spot you're seeing in between her thighs is part of said black skirt. Probably would have made more sense if it was a different color.
ha after reading your critique it took me a while to realise i was sitting brow furrowed in concentration, nodding my head in agreement while staring closely at a panty shot.....would have been much less awkward if i was alone in the room O____O