How many shades of grey?

Last time I took a photo here the sky was blue - well, half blue at least - and the loch even more blue. However, this is actually more typical of Loch Eck, taken on an afternoon when we were lucky to walk for over an hour without getting soaked: the rain came on in earnest just as we got back to the car.

Taken from the west bank of Loch Eck, some way before the waterworks.