Image: 5D Mk II, 70-200f/4 IS L, f/11 at 1.5 sec
Clouds are a difficult thing to expose, normally the image includes other objects at the far end of the dynamic range, like a hill, lake or mountain, playing havoc with most cameras exposure systems.
Live view exposure can really help tame the overall range of light to help bring out the details in the cloud, with out over or under exposing other parts of the scene.
This scene played out in just a few seconds as the last light of the day highlighted this low hanging cloud above the sprouting wheat fields of the Palouse.
Ross Images In Light