I agree with Roman's suggestions and I would also like a trip down your way. Here are some ideas I visualized looking at your picture:

Crop1

This one shows the cactus, but of course you would get in closer and also compose to not have the bright spot in the upper left corner.
Crop 2

I couldn't squeeze any more colour out of this small crop, but you could from your original. The purple clouds and the rocks are featured in this one.
Crop 3

This one shows the beautiful light on the clouds, the rock face and the river.
You have some beautiful country there!