I think the third image is an absolute cracker, the fourth is lovely but I think it might be nicer if you cropped off the top with the really dark blue cloud, just leaving the lovely light clouds :D
3 and 4 for me also, they are a good bit better than the first two I think. The 3rd one, I think I’d crop a little bit off the sea to the bottom of the image..
Really like the last shot – just find the cloud in the top right a little too dark and distracting – still think it should be there, but a little lighter perhaps if possible.