I wanted to make the rat wizard look as though he was appearing from the shadows, lit only by the burning candle and glowing orb. To give that illusion, I added a little of the light green to the underside of the rat, as though it's coming from the orb. Then I added some of the yellow to the tips of his ears and along the top portion of his body as if lit from the candle above. I think the contrast between the black background and the light yellows and greens really gives the scene an eerie feel.
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