Well half-orcs should not look like orcs. They should look like something in between, neither monstrous nor handsome. Personally I would want the faces available to give a variety of orciness and able to represent second and third generation half-orcs whose visual traits are almost washed out.
However, I must add, because this is one if my hangups. I personally have a thing against depictions who give half-orcs tusks but don't actually change the shape of the mouth area to accommodate them. So it ends up looking like they just have weird white things attached to the outside of their lips rather than teeth protruding from the inside of their mouths.
