Garth,
That's a very innovative and logical approach - one I would almost expect from such a refined painter. While refinement can become an addiction with sculpture, your piece does not look overworked at all - in fact, your method of adding slip definitely helps the skin look more lifelike and fleshy. I would almost worry about the slip sealing the "pores" where the gases escape through the grog. When you say there was some cracking, was this limited to just the surface, or did the cracks run deeper? I am assuming the cracking occured during the firing and not before while it was drying. There doesn't appear to be any blistering between the slip and the main body, so you did a great job addressing the cohesion issue.
About that strange variegated yellow color - could it be that the brushes you used to mix and apply your slip still contained a touch of paint pigment? If so, that would explain it.
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