I did some extreme research regarding how Hollywood film develop their business. how they make photo realistic image. so based on research I search some tutorial and find the tutorial then do my own way. and its really work. But surely it is also critical to understand in the layer of path . see the composition complexity
http://2.bp.blogspot.com/-o6m2UDB6K6Y/Ty3BH9ILUqI/AAAAAAAAA2U/XkIHiY9gOv4/s1600/justu.jpg

and here is the final finish only for one scene 

http://extorvfx.extor.org/wp-content/uploads/2009/10/eyeon-fusion.jpg