Is it appropriate to hang Peking Opera masks in the living room?

The red face may be Guan Yu, who is the main wealth of Wu Caishen and has the function of guarding the portal, but it's hard to say that hanging a face doesn't work. You can ask a professional feng shui person.

Although there are faces of Zhao Gongming and God of Wealth in Beijing Opera, Zhao Gongming seems to have a black face, although both faces are in the form of copper coins.

In our Shaanxi province, there is a kind of Ma Shao facial makeup, which is used to suppress evil spirits. Generally speaking, it is either hung across the hall or on the porch.