First of all: this is a very interesting image to look at.
However, I think I understand why you're looking for having something else, still.
It is difficult to come by, but maybe it's the ground. The ripples don#t look good, and somehow, there's too much yellow.
Then there's the question of depth. Upwards, the impression of depth is great, thanks to the hanging bridges. But on the ground towards the far away canyon walls, the imression of depth is lost.
If you're looking for more drama, why not have a few floating fog-like bands travel through the canyon, partially blocking sight? Maybe a little bit of vegetation can also help add a sense of scale for the ground?
This is what I could think of for now. Keep it up, as I said, a very interesting image to look at!
Cheers
Frank