Rango process from ILM

Note character design, etc.

http://www.hollywoodreporter.com/race/rango-progression-reel-oscars-gore-verbinski-paramount-animation-291967

Visions of Light

Please watch this over the weekend as Weecho suggested.
Find light references for your own work.
(This is a wonderful, life-long subject, and will open your eyes to possibilities.)