The
anime style custom target should fix the jaw (and give a more exaggerated feminine body shape, if that's what you're after). I think this was suggested in a different topic, but you can also go to the source and re-download the official targets to put in your custom folder so you can apply them a second time (although if you save it wrong, it saves as a text file and makehuman can't open it?)
Since this is relevant to the topic, I'll post what I've been (slowly) working on the past few months. The model sheet, and my most recent test render. Here I used the anime slider but not all the way. It looks decent even though it was meant for female characters, unfortunately the anime-ized body goes outside the carefully fitted clothes. Which is the reason why I'm really hoping a oscalon makes a version of the anime slider that affects only the face. Like you, I also spent a long time refining the face in makehuman but I was never quite satisfied. I started over with a new MH model for this test render when I finally noticed that oscalon posted the anime slider. The clothing was done earlier, in the marvelous designer demo and came from the fearless makers
men's three piece suit (and for the sweater, the marvelous designer store).
and just in case anyone wonders, yes this character is male...