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You have got me there. What is OSL?
Now with darker armour (with hint of green), darkened ends to hair (very slight), darkened whip and starting to work on the skin tones. Possibly the skin is too human looking?
Object Source Lighting. Basically, rather than just standard highlighting, you consider where your light source is (and also what colour it is) and then highlight accordingly. So, someone holding a lantern with a yellowy flame will have a strong yellow highlight close to the lantern, fading into a dimmer orangey highlight further away.
Sorry for the slight hijack here, but basically, then, there are 3 main ways to highlight?