I have learned that to photograph a sheep, you have to be a sheep, at least part of the time. Being a sheep is not a natural position for me in the world, I am not a ruminant and not a flock animal. But I have lain with them many times putting the camera in front of me, sitting still until they grace, I bring them bits of apple and some of the softer donkey cookies, which they love sometimes. It  helps also to have a border collie watching your back, fixing the sheep with a steely gaze. Sometimes, they will just lower their heads and co-operate. I am working on my sheepness.