See, I told you I would post sooner. Well, the first version of this zombie old dude kinda bugged me in the morning. So instead of working on other things I tweaked him a little bit. The main thing bugging me was that I was not describing the forms enough. So I added more shadow to his chest and legs facing away from the light so you can get a sense of a side and front plane to the torso and legs. You can compare the two to see what I mean.
Also, the first rim light I put on his face and clothes (screen right) were too "cool" as in temperature. I changed it to a more yellow orange (a warmer tone) to really pop his form out on that side which I think created a bit more contrast and "pop" to the image. Finally, I added some detail shots of the head and dead head. The main thing when you color; make sure you know where your light sources are coming from and make sure to stay consistent with it. Hope that helps.