I love places like this, it reminds me of my short break on the Isle of Skye.
Its a good shot, but not quite up to your usual standard IMO.
The composition works for me, symmetry on the vertical and thirds on the horizontal.
The thing that I'm not sure of is the sky.
The ND grad used for this shot is too strong, and the grey in the clouds detracts slightly, there's also a red colour cast at the edges.
When using ND grads the sky is supposed to be at least one stop brighter than the ground, to make the scene look natural, this can be fixed in PS though.
Using an Adjustment layer, adjust the levels using the grey colour picker by selecting a grey area near the top of the image.
This will make the sky brighter, and remove most of the colour cast.
I would also create another adjustment layer and increase the saturation slightly on the greens, then the reds to bring out some of the detail in the grass.
Your standard of landscapes is a lot higher than mine, I have a lot of catching up to do.
