The Bad Monster and the Nice Monster.

When you're drawing the evil monster, you have to make it seem like it's a zombie. Just emotionless. No pupils or else he can have feelings like a little puppy. Yellow to red eyes (to not make the viewer feel like it's a ghost). It must have anger, so yellow-red is the way to go. Not a lot of teeth like a shark but it should still look like shark teeth. If you make too many teeth it's basically not humanoid and doesn't "fit in" to the monster you want the character to have an intellectual conflict against.

Yeah, so what can it be? It doesn't have to be an orc. It can be a bat-like humanoid, a reptile humanoid, or a pesty rat humanoid. Many different animals that we have in the world, and their damage to humans can be made as a bad monster.

So you want to make a nice monster? Then it needs pupils so it can show feelings, eyebrows so that it can show affection, wether it be happy or sad, it shows that it has emotions. Shadows around the eyes does not mean it's an evil workaholic. It's just something to blend in with the eyelashes that makes you memorise the eyes better and it's pretty cool too.

Whatever you do, don't make it look alien. That might be for another class.

Bon voyage! See you!