When they talk about the books' different visual styles, they frequently say that Eisner's drawing ...

... is much more detailed than Curt Swan's.

(This panel is less than half the size of the Eisner panel above.)
I think what they're trying to say is that Eisner generally makes more marks per panel, because he's cross-hatching. But I think we have to agree that cross-hatching isn't the same thing as detail. A vast field of cross-hatching, by itself, reveals no details. And it's true that the background in Superman 331 drops out a lot in favor of a field of solid color, but I don't think the difference with Eisner is really all that distinct, once you account for the cross-hatching.
So, clearly, one of the things I'll have to talk with my students about, in the weeks to come, is the difference between shading and detail.
This other generalization really baffles me, though.
My students keep saying that Curt Swan's characters are much more cartoony...

... and Eisner's are drawn much more realistically.

What do you think they are talking about, here? The best guess I can come up with is that they mean the character designs represent a more realistic variety of body types—pretty much all of Swan's male figures have the same build in this comic, and Lois's face looks a lot like Lana's. But can that really be what they mean when they say Frimme Hersch looks less cartoony?
My other hypothesis is a bit dispiriting: the students had already decided what they thought a superhero comic looked like, or what a "sophisticated" comic would look like, and they didn't really look at what Swan and Eisner had drawn.
Any other theories?
They also keep saying that Eisner's writing is more sophisticated that Marty Pasko's—that it uses more advanced vocabulary (and, presumably, more complex sentence structures?). That's not a note about subject matter, as far as I can tell, but about diction and style. That claim really has me perplexed. Is it merely coming from Yiddishisms like "tsimmis" that the students probably had to look up? I don't think any of the students noticed that most of the individual panels in Superman have more words in them than most of Eisner's pages do.
Help me out here.