Throwing my lot in here as a comment on the races, both as a (+1) to rd's and my own input:

Love that you delved into small details to characterize the whole. I'm with fleshing out the races a bit more (which I'm sure you're intent or at least ideas lead towards). An add-on to the idea of interactions that I thought of with was the idea of religions or expansion of philosophies that characterize the peoples and how that plays out in their relations to each other. I love how rd spoke to

For example, are there whole blood humans or orcs who resent the half orcs? If so, how does this resentment play out?

My thoughts went in the direction of goblins' attitude for humans. Humans are the creation of goblins, how does that make them feel/interact with humans? What are the power dynamics if any, knowing as well that they have such a short life span brought about by their makers.

Life span is a brilliant factor in race population, view of the world, and so forth, as you had delved into. An interesting look into how race psychology works is comparing them to others in light of their physiological or ideological differences. Again, you've already done it (i.e. dwarves and alcoholism, and goblins not amounting to much) how they play into other races would bring (in my mind) good context as well. What is the goblin relation to orcs or half-orcs?