Contrast Control Mask
1 Open image with clouds (mask2.jpg from mask folder)
2 Duplicate layer by dragging background to the "Create a new layer" button in the bottom of  the Layer palette
3 Image > Adjustments > Desaturate
4 Image > Adjustments > Invert
5 Change blending mode to Overlay
 
6 Filter > Blur > Gaussian Blur
7 While looking at your image, slowly move the slider bar to the right until the image starts to looks its best.
8 Reduce layer Opacity a little to the left (to reduce the intensity of the contrast control mask - 70%)
 
optional Click on background layer
Image > Adjustments > Color Balance... to tweak the color balance a little (add a little red or yellow)
   
  File  > Revert
  Ctrl > Z, Z, Z