I want to ask, is it illegal to shoot mannequins in hotels? A group of five people taking nude photos! Will it be closed for fifteen days?

If what you say is true, a naked group of five people may be suspected of violating administrative law, specifically the Law on Public Security Administration Punishment. 15 days is possible, but in practice, the identification and punishment of this situation is flexible, and maybe anything is possible. It may also disturb other guests' rest, which constitutes infringement. Be sure to pay attention. I hope my answer is helpful to you.