i think it's a mix of morphs ++ and the base facial morphs that come with victoria 4.2 and yeah it very well could be a D/S render using uber lighting with uber shaders and elite skin textures or uber surface shaders and things like that but i have come close to getting a smile like that in a render setup once lol

 

when you click her head there's the sections like morlphs++ and base which has the base, vismes, and morphs++ and another morphs++ section you may find you have to use a cpl of the sections to get a smile like that happening