I read that Dr Hayes who did the facial reconstruction actually said that it should be used as a likeness. Which is fair. If you look closely (and ignore the hair), the angel depiction actually looks a lot like Khandalyce as an older girl! It's hard to see Karlie there because of Karlie's lack of facial fat and that hair.
I agree. It looks as good as I'd expect to see taking her leanness and hairstyle into consideration. They couldn't have identified her cowlick from skeletal remains.
I can also see that it would have been possible for the police to make all those links between the DNA and eventually they probably would have. Unfortunately they were dealing with a huge number of possibles and would obviously have to eliminate as many as they could before investigating in depth, making personal contact with the short list and determining the confirmed location of every possible unaccounted for child in the country.