: The "115" likely refers to the frame number in a high-speed digital sequence or a specific selection from a larger "lookbook" or session.
: In such high-contrast setups, photographers typically use soft-box lighting to maintain the texture of the tulle (tutu) while ensuring the red of the chair doesn't "bleed" or oversaturate the shot. The Red Chair - Ryan Lips Photography SharonRosie_PurpleTutuRedChair_115.jpg
: The name suggests a collaboration, possibly between a photographer and a model. : The "115" likely refers to the frame