Things to be considered when integrating CG with Live Action

These are some of the things :

• Light: Direction - intensity - over all color - source count  
• Shadows: Direction - Color - Strength - Soft\sharp - contact shadow 
• Reflection: Strength - over all color - the distortion
• Matching: White & Black Point
                   Depth of Feild
                   Grain
                   Camera Destortion
                   Color Feel