I tried doing a head and shoulder mount quite a few years ago it turned out like Eshter Ranzens cat so i now leave it to the experts, its not as easy as you might think you need to be very artistic to capture the moment in its life.
Have you seen some of the examples that have been sold on ebay they look like they have come through the wall.
The extent of my taxidermy skills now relate to head bone presentations the long nose cut being my preference followed by a full skull