Thanks for the kind words fett prop. Here are a couple other photos of the back which I prepped with a hand drawn stencil and the cheeks I had done but had problems with the masking tape as it pulled up some paint >.< lol. No worries though as I went back and re-painted the lower cheeks and dome with multiple coats .
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I figured I'd do the mandibles<above> and then redo the upper cheeks by hand as described by RS in his tutorial. I've used Steve the Swede's ESB tutorial for help with the ideas for tracing <eyeballing it> and then applying the latex masking fluid.
Unfortunately I couldn't replicate the exact color on the back but I figured the green will take up atleast 2/3s of the back and I can fill in the rest of the tan with lark dark grey topically along with traces of silver and the light gray.
Thanks to RS, Marrow Sun, Evan, and Steve the Swede for some direct and indirect help on this project. Otherwise I wouldn't have come this far! :cheers