Awesome work on the cougar (or lion, or whatever it was), and I loved the shading and detail on the horse's head. Always good to see good animal pictures, keep up the good work.
Some criticism on the "antelopes":
-The face on the left one is a bit too round (looks like shes puffing or holding her breath or something)
-The ear is a little too high up, but not noticeably.
-The back horn would be coming out of the back of her head.
-I believe someone already mentioned the differences in eye sizes?
Besides those very small things, the pictures are great. Would be a lot better with some shading or texture thrown in; color optional.