No.3 is a joy to see, something a little bit different, and the black sky is fine by me. I think the composition would benefit from a very thin white stroke round the whole picture to help define the edge of the image.
No.2 I also like very much. I hear the other comments about cropping the sky, but I'm not sure about this - it would only have to be a fraction off the top.
No.1 my least favourite - shame about the red tin roof bottom right, but still a great image.
Assynt was the first area I went hill walking in Scotland. As an English man I was blown away with the hills, the desolation, the atmosphere, and I suppose it was the area that got me into Munro bagging, So I've got very fond memories of this area.