I like the capture and DOF, but I agree that the background does bug me a bit. The DOF is right on, it's just the background that doesn't help. Trees to sky and back to trees, no matter how blurred the background is, it still takes a bit of the attention from the foreground. Maybe a tighter crop would work, sheep on the right taking most of the height of the frame? That would still leave a less distracting green background with a few sheep out of focus and of course the fence.
On the other hand I like the in focus (grass?) and the rock on the right, just cropping the top a bit may work too.