the orcs appearance is fine, but they should have angrier facial expressions and louder angrier voices
edit: orcs appearance is fine, they should have angrier facial expressions, louder angrier voices, paler skin, no eyebrows, and are considered beast npcs with their own walking animation
I thought Orcs served a perfect role in oblivion: Mostly civilized, but almost always hiding a core of aggression (not necessarily violent, but very assertive.) The Skooma dealer gang in (I think) Cheydinhall was one of the best examples. The orcs would close dialogue repeatedly. From Dulfish gro-Orum, taken from the UESP wiki:
""Get lost. Or I'll pull your arm off.". The next time, he'll reply with "You don't listen? You stupid? Crot. I'm wasting my breath. Then go ahead. Stand there. Talk all you want. You're a fly. Go ahead and buzz." but will at least let you ask about Cheydinhal, to which he will politely respond "Look. A fly. Buzz, buzz. Hey. Look everybody! I'm talking to a fly! Buzz, buzz, buzz!". After that he will only ever say "Buzz, buzz, buzz. Go away, little fly."."
This was so astoundingly annoying I actually wanted to punch the guy. I think that went over great to get the right feel of how a hostile orc would act in a place where hostility gets you beaten by guards.