Here is my final image for the challenge on subdivisionmodeling forum. Unfortunalty i have no time anymore to work on it Because i'm going in holiday for the last 2 weeks of july. but i'm happy with the result. It was a really great challenge for me to make a digital double.

Ref 01 =>http://img299.imageshack.us/img299/5475/dwref01gt1.jpg
Ref 02 => http://img248.imageshack.us/img248/3676/dwref02wf3.jpg
Ref 03 => http://img256.imageshack.us/img256/564/dwref03lu5.jpg

Bonus: Here is my basemesh => http://sillord.free.fr/Collings_BaseMesh.obj