So here is another image from the video shoot that I didn't want to put up because I think it could be improved compositionally. In the interest of encouraging friendly, constructive critique, I'll start off by saying what I would change about this picture. Add comments if you want, or post your own pictures with your own thoughts.
I wish I had moved to the right and perhaps raised the camera a bit so that the converging lines of the ceiling support and the sidewall thing with 2 lights would converge on her head more clearly. One of the 4 spot lights also wouldn't have been obscured, and her head would have been placed on the upper-left-to-lower-right diagonal of the picture.
I don't like how the shelves are kind of growing out of her right arm, and perhaps some kind of lighting thing could have gotten more separation. The far left of the picture has a dimly lit strip that I wish wasn't there either.
But I guess it's not too bad as it is, because the picture emphasizes her verticality and places the focus on her upper back --- often one of the most beautiful parts of a ballet dancer. If only it wasn't so dark! The lines in the compositional analysis were drawn by hand in Preview, so the lines that are perpendicular to the two main diagonals may not be perfectly at 90 degrees.
I'm happy with the tonality of the picture, as it represents the limits of my current (meager) skills for post-processing into B&W.