I was doodling this on lined paper, so this’ll take some work, or some rework to do anything with it. But, I think it shows the general idea for this location (a rough longhouse structure in the Wilderness built of stone and timber, backed up against a low cliff and roofed with felled trees).
This wasn’t meant as finished art, and it probably won’t end up in the adventure; it’s the kind of thing I might do in a game I was running for my own players, but it’s not finished art. There will likely be a plan of this place, and maybe also a section through it to show what it’s like (or just a good descriptive paragraph).
Added some quick pencil shading for a little more (hopefully) clarity and readability afterwards; here’s the original: