I am not a qualified taxidermy expert, so take this FWIW...but I think it looks like you have done a very nice job there. I second the notion that Horsedoctor gave you, take it to the pros, they will really be able to help you. You mention that you are new to this, what better time than that to get solid advice and critique?
Even if a pro can spot some areas for you to upgrade, I would still have to say that you are off to a good start and your mounts look better than some I have seen where the person doing the mount represented themselves as an expert.
The only other thought that I have for you is that I have mounts that have been done by three separate people and I had to learn the hard way to not just trust the "friend of a friend" who does taxidermy on the side. The last several mounts I have had done have been by Durk Sterner, who actually posts here on IW sometimes as Stuffy, and the difference in those mounts v. the "early days" when a "friend of a friend" did them is quite noticeable, even to me.
Also, the quality mounts keep looking good through the years v. the lower quality mounts. In my experience, the lower quality mounts may start to show cracks, they may develop some yellowing around the eyes and/or ears, the black nose may fade and/or look duller and the hide may show rough spots too.