Thanks for the tips especially the one about the static grass (silly of me ;-))
Do you mean the collar where you used Khaki? Is it correct that you used grey on the head?
Nice work. The trick with black is not to use pure black as a midtone only deep shadow. Have a look at my Sherlock and Watson. I've used kharki like you for the highlights but as a midtone whick improves contrast overall. Also watch the static grass , try and keep tidy and off the sides :)
Thank you very much for the feedback, so I can improve! The highlight is back and Khaki, not green. But I like it more then the traditional grey.
How could I give some more contrast, can you give me an example?