The colour one looks great.
I did push the sunset one a bit in lightroom. Main one being moving the white balance from 'as shot' (4300K) to 'flash' (5500K), turns the brown to orange. (crop 10mm ISO200 F6.3 1/125 one flash at the bottom of the shaft at 1/1 and one in my hand at 1/4).
It was a bit of an experiment with the portrait orientation. I took a similar shot landscape in the same place a couple of years ago with a different model. I think I prefer the composition landscape and a better view of the face, although the big area of out-of-focus foreground distracts me now! I can't look at cave photography anymore without trying the analyse how it was shot. I'm not sure if it's ruining my enjoyment of it or not!
The shaft looks a lot shorter in landscape for some reason though.
Sunset is a great place to experiment, there's a lovely dry ledge to open peli cases and the pitch itself is safe, no loose stuff and easy to work above.