Here's a 1968 Millie the Model page showing what a rough life models have, kind of like human statues without the metallic paint. The editors reduced Millie's breasts in panels 2 and 6 as you can tell by the blue lines and the hint of white out that I was not brave enough to scrape away.
This is just after Marvel abandoned its attempt to make Millie a serious romance series and returned to humor for what was left of the series. Unlike Patsy Walker, (see my "Way too Weird" gallery, Millie was allowed to fade into dignified obscurity with rare appearances in Marvel's super hero comics as recently as 1994. Talk of her being reinvented as a teenage tennis player and of a movie have apparently come to naught.
Though no artist was credited on this page or by the seller, the sources indicate that Stan Goldberg did all or virtually all the Millies after 1959 and he is credited here.