Mixing images together with photoshop?

gawsh

New member
I'm doing an assignment and have put bits and pieces together into one image, but how do i make them look like they fit in?

E.g I'm making a "hell" background and chose the dessert and have added far distant cities and skulls etc to my origional desert pic. How do i make them all look the same (some are brighter than others and obvious they've been done in photoshop).

Also how do i add an orange tint to the entire image with fading into black around the edges?
 
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