This is lovely. It captures the scale and the drama beautifully, and the path leads you past the wall and towards the distant valley, leading you in and preventing the wall from both blocking the composition and allowing it provide a foreground feature to give scale and depth.
I feel that there is just a little too much saturation, particularly in the rather bright green of the valley, and the contrast looks a little jacked up on the heather and shadow in the foreground hills. The mass of white cloud on the right perhaps somewhat upsets the kilter.