who has been looking for clues? i added a touch of blur and all kinds of stuff is popping out. in the tree. see the cross? a lot of verticality of shapes on the left. is there some doc on what researchers have found? i think i can help.
The shadow of the blue toga guy is inconsistent to his body. In the lighted area divided by the shadow of his forearm you may see the twin islands. Also writings in Latin in his slipper straps (I think). His left foot (flipped) reads IVLIV (S) or (A) meaning Julius (Caesar?) or Julia.
that did not take long. holy crap, the gap between his arm and knee is huge in shadow, among other things. good solid find. also, look at the detail of the toe nails. Look at my toenails! normal for artists of the day?