Be aware of your edges and where they fall, Iris. Did you intend to chop the point of the rock off with the frame. You might have acquired more tension and energy if a ribbon of blue was allowed to flow around that point. Alway scan the edges of your frame -- as well as looking into the middle of it.
I was really fairly uninspired by the sand tufas - your images have made me change my mind - your wonderful low point of view - really makes them come alive.