Those clouds are FANTASTIC, and you captured the colours and texture (!!!) superbly in my opinion. However, I think that the clouds are too overwhelming in images numbers 1 & 3... They feel so heavy that they seem about to fall and crush whatever is under them. This is why my favourite shot here is #2, which almost looks like an abstract painting. If you don't tell people that those in #2 are clouds, I'm not sure they'd be able to tell.