For the race thing, I think it would have been a more useful comment had he posted BEFORE Lockwood revealed the same thing. Now it just seems like he's reacting to that in a sort of "ooh, me too!" way.
For racial diversity in artwork, you need to figure whether the setting has such racial diversity. In addition, you need to see if your artists can actually... you know, make racially diverse art that doesn't look horrible. I mean, if they can't even draw a white guy sometimes, trying to find more colors to use might be worse than just having the white guy.
(I'd also like to note that gnomes were generally brown, but of course another race that was generally drawn as "tanned" rather than "african".)
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