I agree about the butler's sleeves looking ripped, but other than that I think the colour reuse is fine. I think if you change the shapes of those shadows, you can remedy the problem without adding colours. You could also just use that darker greenish colour instead of the skin colour, using the skin colour for AA and tips of the narrow folds:
On the knight, I'd use the off-white instead of the beige for the armour highlights. It doesn't contrast too much and makes the knight's form clearer, in my opinion. I'd tone down the amount of texture on that armour. The knight's forms aren't very clear, especially compared to the sprite. The pauldron also looks disconnected from the torso because of that deep shadow.
