Descending Kerlingarfjoll Hills

While doing landscape photography in Iceland, I was suprised by four mountain bikers descending one of the hills in the Kerlingarfjoll area. Here is a series of three images showing their descent (down stairs, no less) toward the boiling springs. I neglected to shoot their grinning faces after they crossed the bridge. I was too busy helping them take pics on their phones to take one on my camera.

What artistic feedback would you like if any?

Any suggestions on crops for a better impact?

You may only download this image to demonstrate post-processing techniques.

I especially like the middle one. It has great lines, depth and a real tension to the image. Very cool!