I'd do a pretty serious curves adjustment in the conversion from raw, if I'd shot it raw. The highlight in the middle of the cloud is completely blown out flat and unatttractive (it's probably the sun there, so most likely there's nothing to be recovered, but you might be able to feather the edges in a little more gently). Then I'd pull the tones in the meadow either up a bit so it doesn't look dark, or down a bit to push it to a silhouette. The latter is probably a smarter choice, since the tilt suggests that this is a photograph about a cloud - so de-emphasize the earth as much as possible.