Have they done a facial reconstruction of Maria and Alexei as what was done with the other members of the IF? I am interested how they may have looked at the time of their murder.
In the National geographic channel documentary i saw about the finding of the last 2 children, they clearly said that the bones fragment were so tiny they could hardly say something; it was not even easy to say surely they were human beings! And, if i recall well - i'm going on memory - none of those pieces was from skulls, or at least, so few of them they could not did a reconstruction. Even extract the DNA and analyze it was very difficult.
The documentary is pretty famous, so you can look for it; the original is in English. It's vert well done.