Another way to deal with the shadows, (yeah, I know nobody asked me, but...) is to render the creature in poser against a plane with inclinations and ligh sources that match those of your picture. Then, in photoshop, you detatch the shadow from the figure and, taking good care to fit it exactly where it used to be in the original scene, blend it against the background in a subtractive mode, so that it only darkens the places it overlaps with the picture, giving the sense of real shadows... Did it once... was not the easiest task i ever performed but was worth... Hope to be of help