Is there any Sharia-related reservation in selling wallpaper that has a woman's face on it, given that the seller knows a man will be installing it?

The safest and most দায়মুক্ত [relieving one of responsibility] approach is not to sell images of faces, due to the scholarly disagreement and prohibition held by some, and due to the Prophet's (peace be upon him) saying: "The image is the head, so if the head is cut off, there is no image." Moreover, an image of a woman's face is considered 'awrah (intimate/private), and looking at it is forbidden, whether it is real or reflected in a mirror or similar.