Thanks for all the comments. The last picture was in Grass Valley in California by the way. Haven't seen clouds like that in a long while. Shanghai is too polluted to see anything. It was pretty amazing for me to see clouds in California at that time of the year because I had the impression its always no clouds , no rain and blue.
K so for the last picture , would a ND grad allow me to lighten up the foreground a little bit while keeping the sky the same?