So, these paintings - judging by the artist you've linked - are not medieval. They're from the eighteenth century, and these women (and men) are being depicted with powdered hair and wigs. I've written a previous answer on this topic that might help you to understand:

In England 1700s(?) How did the trend of caked face paint, absurdly large dresses and wigs come about?

I don't know why this is flaired as mail and stamps, but OK.

Because it says 'post' in the title and the filter made a false positive. I've fixed this now. Apologies!