OK, one of my most impressive mounts...
Last summer I was fortunate to be able to attend the Boone & Crockett Club's 30th Big Game Awards ceremony held at the Bass Pro Shop's Wonders of Wildlife Museum in Springfield, MO. Describing the taxidermy in that museum as spectacular is an understatement. I have never seen mounts or wildlife dioramas in any museum of natural history or even in Safari Club's wildlife museum in Tucson, AZ that are as impressive as those that are in the WOW museum.
I personally think that shoulder mounted animals look better than European skull mounts, and that full body mounts are more impressive than shoulder mounts. The amount and quality of habitat in full mounts does a lot to increase the impressiveness of the mount.
I also think that mounts of rare or exotic animals are more impressive than mounts of common animals.
Usually a larger mount is more impressive than a smaller mount. A shoulder mount of a bull elephant is more impressive than a warthog shoulder mount, a standing Kodiak bear mount is more impressive than a black bear rug.
In my 50 some years of big game hunting, I've been fortunate enough to have acquired (I think) a pretty good taxidermy collection. I have many of the mounts that some previous posters said they would like to have just like there are many previously posted mounts that I dream of.
In my own trophy room, very often I think that my newest mount is my most impressive. My newest mount right now is the pedestal Caribou mount that I was invited to have in the 30th B&C Awards ceremony and I think that it dominates my trophy room.