I think it's due to the lack of flesh on the arms that make it look a tad washed out but i can assure you the colours are pretty good against my reference books.
I have put the head and equipment on and placed him on the scene for you to get a better feel for colours and composition, but it is starting to come together now.
Next job will be the arms followed by the legs etc and I'll finish up with some final shadowing where its required, before taking the photographs outside with the backdrop of tree's:-