As to "Zeno" I agree about the beard, but doesn't Raphael have the figure as largely bald, which Zeno was not?

As to the possibility of a figure being Marcus Aurelius, do we have any other examples of someone other than from pre-Christian Greece being in the fresco?

Your reference to the colors has me asking this: I guess it's inevitable that colors are re-used, but I wonder if there is any pattern to the coloring of any of the outfits? (EDIT - I see Nate anticipated and at least partly answered my question here.)

Nate (or anyone) is there any historical or other reason to portray Zeno as fat as this orange-clad figure is shown? I agree about the beard, but the bald head combined with the very large size would seem to me to need some correlation too, or else they point in a different direction.

Good sleuthing to count the balding ones in the painting. We'd have to ask Elli about this, but I wonder if anything can be said about whether Greek men (ancient or modern) have a more or less tendency to go bald than Romans or other Europeans(?) I am by no means expert on the racial characteristics of Greeks but I wonder if anything can be said about their relative baldness. Maybe the number of balding men in this picture is an indication of using local figures as models rather than the busts - and maybe the sculptors tended to embellish the amount of hair?

Nate what about that pronounced downward pointed nose on the orange-balding figure. Of course we have to keep in mind Don's caveat, but the nose on the bust of Zeno doesn't seem to be so pronounced in pointing downward (?)