I'm not a doller so its hard me to c/c, but the only thing I can see is the shading seems off in the dress on the bottom doll. I love the av, it looks perfect. =) Dont know how to explain the shading though. Did you burn it? It just seems like there isn't any depth to it. Like you mostly see a fading kind of shade that defines a curve, whereas with yours its all the same degree of shading.
That make sense?
EQ2 Elfie
Av:

BAse by
Oops I Arted!
Doll:

Base by Autumn Pixels
I made these as part of an exchange and tried lots of new things, could use a bit of c/c.