I do like the composition and things do look to be in scale. Maybe add some ink to the quill...

As for the lighting, I am not too sure where the second candle is located....(clock-ray location please?) because the shadows of the glowing gems look a bit off. Also, wouldn't the g;ow of said gems counter any effect from the candles? I also do not see any lighting/shadow from the moonlight.....I see reflections on the face, but no lighting effects...

I do like the shadow cast by the ink bottle...nice and subtle