the tail and mane reflections look like the light source is all over the place, in this case he needs reflections on his back and lower mane. i think the depth of the shades here are low contrast, and that is fine right here with the volume of light that appears to be present. when lights and shades are important, the eye shine should be used with more care, the shape or location on the eye now means something. the shadows on the back legs are on the wrong sides, they are cast from his belly. that is all i got.