Thanks. This barbarian is a little rough by my standards, but I follow the same flow I usually have for muscles.

I'll paint all the flesh a red-brown (VMC Saddle Brown) and then sketch out the shapes of the muscles with a medium flesh tone (Citadel Cadian Flesh) then I'll blend between the two with a combination of thinned flesh and a thin application of flesh wash. Then I'll go back to the original traced shapes with the medium flesh mixed with a lighter flesh. Continue to lighten and then mix ivory into the light flesh tone for the most high edges if desired.

I think my best example is Weapon-X: