Mine are still in progress (elk isn't much but hey its something ), the pronghorn has a bit more yellowing than I'd like still and at this point I was thinking of hitting it with some ivory paint to touch it up (I don't want it brilliant white) but its too cold in the garage at the moment.
I don't think I degreased it enough rather than a lack of peroxide. It's just certain spots like the top between the eyes and such that are still a bit yellow.
Haven't decided mounting yet, need to figure out some spots. The antelope is easy enough, no great spot for the elk.
Copy on the degreasing. They look great none the less! Myself and a couple buddies have a side project called skullhanger. You should check us out, and post up your skulls when you get them hung.