What does it mean his face was burnt like a brand?

Answer 1

A branding iron is a metal rod with a symbol at the end, sometimes a number or letter. It's used by heating up in a fire, then pushed against the hide of an animal (usually a cow) and burns the brand (or symbol) into the skin of the animal. So the expression "his face was burnt like a brand" means that it appears to have a well defined mark like a symbol or letter, and not just an amorphous splodge.

Answer 2

1. Women used to grow their hair very long but wear it "up" in a bun or other style where it was wrapped around the head and held with hairpins or combs. Look at pictures of women in the 1890s for examples. When they wanted to get casual, they let it hang loosely and naturally. "She loosened her hair" means she took it out of its tightly wrapped hairdo.
2. A casement is a window, or more accurately the hole in a wall where a window is placed.
3. The man's face did not really burn, but it got hot from a rush of blood into it. In other words he flushed or blushed, either with excitement or embarrassment at seeing the woman in the window in a state of partial undress.
4. A brand is a torch, not an electric torch but a stick which is on fire at one end. It is closely related to the word "burned" and the names "Brendan" and "Brenda". So we have the metaphor of the man's face burning together with the fairly weak simile that his face was burning like something on fire. O . . . K.

Answer 3

His face was bright red