Near perfect photo-realistic lighting. I also really like how the rather simple brush strokes add just the right texture for the eye to feed on. Nice job.
James Gurney's work is so inspirational. I have the privilege of owning one of his books, Color and Light, and would love to get my hands on his Imaginative Realism. This is a very lovely piece, and from the look of your gallery, you have a wonderful way with light. Awesome work!