Personally, I think the image of Michelle is spot on, exactly how I imagined her.
Regarding the representations of Barbara and Teresa. Teresa I think could probably be a little more “curvy”, since she’s described as being well endowed in the bust and behind department, and I always imagined Barbara to be a little more on the tan side since she’s always described with those nice tan lines! One last thing, sometimes it appears their proportions are a little off or “switched”, i.e Teresa has the “perky” bust instead of Barbara, and Barbara has a little too much up there on some of ‘em if that makes sense?
Anyway, other than that, the likenesses are pretty darn close! Hope this helps