This is like an alternate version of the Nighttime Exterior lighting.
Every nighttime Backdrop or overlay with a Campfire will need an alternate version with the fire lit. The fire puts out a warm light into the surrounding area. You may make also choose to make multiple frames of the Backdrop and fire-related overlays that the game engine can flicker between to provide a dancing flames effect.
Standing characters are further from the fire and use Soft Front Standing Lighting.
Seated characters at the campfire use Hard Front Sitting Lighting.
Transitions: Nighttime Exterior