Wow, looking great so far.
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He has a white beard, a very light colored shirt and his pants are that pale green color. In this image I upped the diffuse falloff on him to see if that would help, It did to a point, you should have seen him before. I could try a different sun direction, but I think I'll have the same problem. I'm also having the same problem with lighting scenes with Nimmie Ammee, she has very pale skin.
If you use a skylight rig, like the ones Yves made available awhile back, and decrease the intensity of the other lights in the scene, that might help to soften the whole scene and smooth out the contrast. I've been using Yves' 8 light rig with the light shadow set to raytrace, 1 ray, and it gives nice results and only a relatively small render hit. Strangely, if I set the number of rays cast to 4 or 16, the results are grainy. Yves also has 16 and 32 light rigs.
Another option would be to use AO, and tone down the sun light intensity. Have you tried AO in this scene? I think you should probably set the ground to NOT cast occlusion.
The stream, I think that's a stream on the far right, needs some specular highlights. Right now it looks kinda like a river of clay.
I'm assuming that Hash will be rendering exr files and doing some post work with AM Composite. If that is the case, then people like me who have never used AM Composite can really begin to see the power of adjusting things like light buffers in post right within AM.