There's no strong focal point, and it doesn't hold up as a purely abstract piece either in my opinion... There's some strong shadows on the left, perhaps if you had used more of them to add some bold detail and interesting shapes to the non-contrasty rock.
Indeed, and nothing but texture, perhaps. Compositional rules pretty much go out the window with this kind of thing, but I feel to create a pleasing image from it there must be some sense of flow within the picture, ir a strong balance of elements, or some process going on. Here, whilst the illustration of texture is admirable, I find a very static image, with no one element to anchor the eye and let the attention, whilst tied, roam through the image. Exposure, colour, light is all excellently done, but some of the more artistic elements of a great photograph are absolutely missing.