Purely for new models.
Working based on a photograph, we have no "tools" that outputs a proper result.
You could use Face Transfer 2 from Daz and convert the result to a G2... but the result is good because of the texture, and the texture Face Transfer outputs is so bad compared to the best skins there is in VAM, that you would need to redo it completely.
TL;DR: if you're looking for a tool that does a very (very very) good base from a photograph without much work, that doesn't exists.