I had the pleasure to be in the Marmoset Viewer beta testing. This is one of the tests I've made. I'm quite happy with the way it turned out.
For those of you not familiar with Marmoset software: shift+drag rotates the sky and also don't forget to check the top right buttons. The one in the left will give you access to maps and topology. The one in the right will make the viewer full screen.
This orc was made for a texturing tutorial that will be finished soon. Until then you can check the marmoset toolbag scene from here https://gumroad.com/l/Jadj