I tried to capture the above lighting in my following image. I really love the strong, opposing colours in the lighting - 

I also found an digital artist whose style really appeals to me; Shaun Slade (NUA Graduate) http://www.shaunslade.com/ . He uses large blocky shapes to create his environments:

The loose and painterly style really appeals to the way I paint, and I would love to try to emulate this in my future environment work. I need to get more confident at applying textures to my drawings, as above (and below) they seem very flat.

Here I quickly applied some leaves and glowy rocks to one of the thumbnails. The rocks need serious refinement, but the leaves work very well at providing an alternate source of illumination.