What is the ruling on buying a hair wig to practice new cuts and styles on it, and is it permissible to photograph it and post its pictures on social media as part of one's work, knowing that it will not be placed on the head?

Wearing a wig is forbidden, but there is no harm in buying a wig made of non-human hair to practice haircuts and styles and to photograph them, provided that it does not involve imitating disbelieving or immoral women. As for human hair, it is not permissible to sell it, buy it, or use it, due to its sanctity and dignity.