Great points, primorge, thanks!

For the record, I wasn't serious about the Julia Roberts look. It's just that I noticed the previous version of the smile wasn't wide enough, and this one reminded me a bit of Julia's when I first saw it rendered.

That last render is just a combination of morphs that's a bit over the top, so it's not necessarily a reflection on the individual morphs that went into it. I've been considering linking the mouth width to the open mouth dial in the final rig, so that one would have to put in extra work to get unrealistic combinations of wide and open.

The rule of thumb I've seen is that the corners of the mouth should go to the outer edges of the irises in a 100% smile. Now I think Antonia's eyes are a bit wider apart than most people's, so it's probably not a bad idea to not follow that to the letter as I did here. Also, someone once claimed that her jaws are a bit on the small side. I'll have to check this with some references, but if it's true, that would be another reason for that gap being excessive. Or, as you said, even if I decide the jaws are fine, they might have to be widened for extreme smiles.

And you're spot-on about the inner mouth flesh not going quite as wide as the corners of the mouth in a full smile. I had to stare at the mirror really hard, but it turns out for me they don't either. So that's good to know. It's true that sometimes I see something that looks odd on the figure and then I check on a reference, possibly myself, and it looks just as odd in real life. Humans are weird-shaped. :smile:

As for faffing about: well, I'm still having fun doing it, and I like to understand how things work and test my limits. Once I've developed the skill and gained some experience, efficiency becomes more interesting to me. Paid work and routine tasks are a bit of a different story, but this is neither of that at this point.

-- I'm not mad at you, just Westphalian.