He is looking rather good. The sculpting and expression work out well, and the various embellishments are solid.
Given the level of detail and texturing on the skin, there are some disconnects in the rendering reflections and textures in the teeth, hair, gums, and nose ring. What are you using for the render? Perhaps they were rendered in a separate batch and simply didn't pick up the local reflections or the settings were slightly different.
This appears to be simply a technical issue in the rendering step that sticks out.
That aside, looks quite good. Very much has that warcraft orc feel like you mentioned on art station.