You can really see the Severan period as a second golden age for the kind of naturalism you get from Julio-Claudian and Flavian coins. That almost eerie tightrope between realism and caricature.
Sadly again I must resort to poor man's copper as I could afford no silver coin of Caracalla. I do have this large bronze medallion, an AE44, struck in Laodocia bought from Gorney & Mosch a long time ago however. I do own a silver tetradrachm of Geta: Cary's ill-fated brother tho.
I think Caracalla had a problem with his diet. He always looked like he was a constipated bully... RI Caracalla 198-217 AR Denarius MONETA
And he looks like such a nice boy: Caracalla (son of Septimius Severus) AR Denarius. Obv. Laureate, youthful draped bust right, ANTONINVS PIVS AVG/ Rev. Felicitas standing left holding caduceus & cornucopiae, FELICITAS AVGG. RIC IV-1 127, RSC III 64, Sear RCV II 6799, BMCRE 276. 19 mm., 3.2 g.