What is the ruling on Muslim women who do not cover their hands getting henna tattoos, and is it permissible for a non-Muslim woman to get a henna tattoo?

It is not permissible for a woman to display any adornment such as dyes and colors in her hair, on her neck, or on her body, and anything that strange men are not permitted to see, because Allah Almighty says: (And not display their adornment except that which is apparent). The adornment that strangers may see is that which is apparent of the clothes. If a woman dyes her hands or feet, she must cover them with clothing from people because it is a temptation, and she should not display them to strange men.