Very nice work! Top row worthy in my opinion.
My only critique is on the beard of the horned fellow. I think if you thickened the hairs of the beard, particularly toward the tips, it would be more believable.
A google search turned up the following examples that seem a fairly good match to the look of your model:
http://thumbs.dreamstime.com/z/old-mongoloid-man-33-9522403.jpg
http://thumbs.dreamstime.com/z/portrait-man-beard-2-4264950.jpg
http://thumbs.dreamstime.com/z/old-mongoloid-man-15-11602736.jpg