I liked your “cow” dunes shot, and the dune shot you were more upbeat about. This B&W of the salt flats (?) is rocking. If it were me, I would try to boost the contrast of the ground, make the salt islands pop some to match that great sky. I shoot 4×5, I can’t get over how much information is in the 8x10s. Looks like there is some vignetting, although it is correctable.
The salt flat shot with the white dots on the ground was definitely a pleasant surprise. Something I forgot to mention on that one is that I did end up with a light leak in the corner of that one. That’s something I’ll have to resolve to make sure it was just me that messed it up, and not a fault of the film holder.