Also on a sidenote, the horns seem very very dark, close to black even, except at the tips, its keeping any lighting from being read, simply silhouette horns, maybe ramp up the specular on the horns to bring out the normal detail?
My suggestion is: you can put a slight overlay gradient in the horns (or if it already has, a stronger one), with dark grey in the horn base and light gray in the top~ This will probably give you better values in the horn. The set looks pretty good so far!
Very nice so far! You might want to add a bit more definition to the face, especially around the eyes & nose. The horns - especially the nasal horn - seem smaller than is typical for most adult species. Keep in mind that the horns were bone covered with a sheet of keratin, and the horns of a living creature might have been…