with the official expression morphs yet to arrive, there isn't a lot options built in as far as her smiles go.  There are a few, but they dont give much variety.  There are also not yet a lot of options for secondary characteristics that go into building a really good full face smiling expression.  As for the link.. I know some are morphs, but a lot are the default dawn face.  There is nothing preventing the chin from being morphed.. if you look at the alexis character that launched with dawn you'll notice she has a very petite face and small chin