OK, I got time to get back to this.  Here is a (small size) raw depth map.  It's unfinished;  I still need to add detail work such as the seams between the road pavement stones and the castle ashlar stones, the chain mail on the horse and the knight, and the shield features.  I'll probably add clumps of grass to the ground to improve perspective.

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5