Or: The Poisoned Apple, Part II
Quite a pointed collection of imagery, since there's plenty to knuckle down and review.
One thing, regarding Michelangelo and your general worry over interpretation of the truth: where would you place the sensation of submersion into a painting, the feeling of the way it overpowers a viewer? As a novice in the medium myself, the experience is what I anticipate and recall best, compared to analyses.
I agree that the Parmigianino painting is full of errors. If you look at it from just a perspective standard it is incredibly off. That figure in the lower right corner would be much bigger. Plus, while it's not surprising to find exaggerated body proportions in 16th century painting, Parmigianino's overall rendering is, to quote Larry David, "Pretty, Pretty, Pretty...all over the place."