You'll find a few wet plate landscapes on my site. The process can be used for portraits, still lives, landscapes, architectural, etc. It's a little more hassle in the field because you need some sort of a portable darkroom, water, etc. Watkins' and O'Sullivan's work was done this way. They mostly did large glass negs with wet plate and then printed them in albumen, but other than the substrate, the process is mostly the same for tintypes, ambrotypes (positives on glass) or glass plate negs. My portable darkroom is a camper on the back of a pickup truck.