tutorial

darkening parts of a picture
http://www.ehow.com/how_7388757_make-other-side-light-photoshop.html

I needed part of a picture darker then the rest. this is what i found to help me do just that. you are able to darken or brighten any specific part of a picture.






                                                         Adding clouds
                                    
          
                             before                                                       after
                 http://www.makeuseof.com/tag/easily-create-clouds-photoshop/

This tutorial explains how to make any thing look like a cloudy sky.  it was really easy to fallow and I was also able to use the same steps when I wanted to make a dark storm like sky.