Are these photos usable?

None of these are usable my friend. You look stiff and uncomfortable. The one on the rock is the closest to being a thing and could be used in an emergency, but you're leaning back which makes your head look small, and you seem to be showcasing a hole in your crotch.

I think 10 and 16 are really the only ones I would choose. These are all decent but you're a good-looking dude and you can get much better pictures. Would highly recommend checking out Alex's video on this on the PlayingFire Yt, I'll link it below but also consider some more activity pictures.

(https://www.youtube.com/watch?v=baie2bL88A8)

These are okay, but I would try to take more during the golden hours (sunset or sunrise). That’s when the light works best, some of these are too bright as evidenced by your squinting which you wanna avoid for clearer photos