The shadowing is phenomonal! Everything is so defined and you can tell where the light is/isn't. Depth is easily seen but the eyes should be shaded in darker to create even more and to give it that haunting style. I would've added some shadowing underneath so it doesn't look like it's floating there (unless it was your intention?). The teeth are very good (sorry, can't think fo the right word). Balance is evenly distributed throughout the piece. Wonderful contrasting between the lights and darks and cracks seem to give the skull age. The ones in the eyes should be slightly shaded in so you can tell the eyes are deeper in the skull. All in all, it's a wonderful piece of work! Sorry if any of this seemed harsh!