Great points from everyone here! I like the idea of range of possibilities as well. You really do not know someone's race instantly. I myself am mixed Western European and Filipino, with pale skin, dark hair, and some Asian features. As I was discussing with a friend earlier today, at first glance, 10/10 times, people will assume I am either Russian/Ukrainian, OR half Asian (usually Korean or Japanese) and half white. Neither of those are accurate. I also live in an area with a very high Russian/Ukrainian population, and work in an area with an even higher one, and I have always wondered, would people finding my corpse think I was a Russian immigrant? Not impossible and while it would be an incorrect assumption, I can see how people would come to it. Especially if I had recently eaten Russian food (love pelmeni) before being murdered. Sorry for the tangent - all that to say, I think it's wise to use caution when estimating race and ethnicity and look at all possibilities.
On another note, in all honesty, I don't think most of Dawn's reconstructions were that off. Definitely not identical, which I think hair plays a big role in. If the recons were depicted with curly/wavy hair with bangs, they'd look a lot closer. None of them did, which is a big part in the disparities IMO. The NCMEC one was...not great, and neither was the police sketch from interviewing the Kinlaws, but to me, Carl's and the blonde one looked pretty facially similar to Dawn, just with the wrong hair. JMO.