There is not a non-subscriber skin tone available that approximates the afro-descended phenotype. Since Ur isn't Earth, I wouldn't complain, but there is a light beige, a light yellow, and a golden brown available to non-subscribers, which seems to approximate all common racial groups except the afro-descended. (no black hair color choice either, but that's sort of secondary to me)
You guys didn't do it on purpose, but racism today mostly takes the form of unconscious biases and prejudices, so I think it's important to be racially inclusive when you can. I want to make it clear that this isn't a sensitive person being offended, but an academic invested in changing the world, little bits at a time.
Full disclosure: I racially identify as white, I was raised in suburban East Tennessee, and I live in a modest means, predominantly afro-descended neighborhood.