Hmmm, the model itself is awesome, but it looks really orcish to me so if it is a model for an orc it should have a skin fitting to it, you see the simple white skin is quite... simple
just one white color and a yellow border, if you can make it like, the yellow to be like leather and the white to look like steel it would fit it better.
About modifying the model - there is nothing to modify on it, ok maybe a little bit to thinner in the plate for the nose, but the model is awesome, the skin needs more editing... I myself prefer the simplest version of your shields because the others have some points that can't possibly even fit for an orcish shield because orcs use round shields... About the helmet... just fix the skin to be more like a helmet, using leather and steel colors, a sharp light to make the metal look realistic and the leather with lines of color variating from brown to beige, and thin white lines...