The physical descriptions of Adam and Eve have changed as well. They no longer glow with joy, they are less angelic in their nature, and, within hours of eating the apple, they are prone to new, irrational emotions ranging from anger to deep depression. As well, they see each other differently as well. Specifically, they are more interested, and worried, about their genetalia than ever before. For Milton, the interior state of the soul is displayed visibly in the physical.
Sin is always visible.