Concerning black and white photos, with "Perfect Posture", the picture to me seems to be in too much light. Not enough dark areas within the photo. Definitely needs dark areas for better contrast. Therefore, I'll vote no. With "Bathroom Mozaic", there is an adequate amount of dark areas, but not enough light areas. Everything seems gray to me. Therefore, I'll vote no on that as well.
My choice is between "Morning Joy" and "Glaring Pane" as both light and dark areas show up best on black and white pictures and are easily expressed. With them, there is a perfect amount of contrast. As these two pictures express these differences the best. "Morning Joy" has a bit more dark shading in it than "Glaring Pane." That is a general weakness for "Morning Joy."
Since "Glaring Pane" seems to be half in light and half in dark, it has the best contrast, and that is the one I'll vote for. Final answer: "Glaring Pane"