Yeah, body language and facial expressions are one of DPC's strong suits, just take the look of genuine look of concern on Lily's face when you take a bottle to the head for her at the Pink Rose as an example:
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Or how sweet she thinks it is of MC to stand up for her and take offense when someone calls her a whore:
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And everyone can tell what this look means:
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But there's more to it than just correct facial expressions, there's subtlety to a lot of the various interactions, like after Quinn and MC make out in public, Quinn ever so slightly bites her lips after she kisses MC:
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The lip biting in this image is something I didn't notice until I actually went looking for it, since Quinn is shown biting her lower lip at every other instance they kiss, which made me ask if she didn't also do so in this scene, and although it's slight, it is clearly visible when you look for it.
I will however say that I find the lack of pupil dilation during erotic scenes to be somewhat distracting, since peoples pupils dilate by something like 30% when they are turned on, but I don't know how eyes and shit work in DAZ or anything about 3d art in general, so there might be a lot of effort required to put that into the various renders/animations. And also, pupils pin out when people take opiates, so that should be added when they're high on heroin/morphine or whatever the fuck they're injecting.