I voted for Angry Sky because I think it the most interesting of the choices. The others are 'pretty'. I'll always vote foe an interesting photo over a pretty photo. People tend to get more immersed in interesting images.
Angry Sky - Decidedly
The Blue Sky image makes me smile. It's a comforting image, not dark, not washed out, riddled with detail. It makes me think of nice things and is just plain pleasing. The reflection on the water is incredibly beautiful and captures the true reflection of its original. It's a happy place. :)