Very impressive achievement. One is ultimately, I suppose, "ploughing the ocean" in trying to create realistic true-to-life portraits of people whose real, true-to-life appearance is more or less unknown to us. But the majority of these resonate with the mental image I have of the emperors from their statues, coins and my vague general conception of them. I'd single out the Flavians, Elagabalus and Decius as particularly impressive. And the Probus is a great "translation" of an inartistic sculptural head. The biggest downside is the complete lack of curly hair -- I assume this must be a limitation of whatever program was used to produce these. Marcus Aurelius, Lucius Verus (a bad likeness, generally) and Septimius Severus suffer particularly as a result.
Where on earth did they get this for Quintillus? Of all of the crisis emperors, he was only one who apparently kept his beard closely trimmed or even partially shaved to a goatee. Very impressive work overall, though!
I don't think they captured Nero's hairdo very well, and I always thought Tacitus was bald or nearly so... I think he caught Vespasian spot on.
I believe that ULYSSES S. GRANT is Macrinus incarnate. Reminds me of The Twilght Zone "Long Live Walter Jameson" https://en.wikipedia.org/wiki/Long_Live_Walter_Jameson
Somehow I imagined there would be a nook in your home that looked like that! That Nero sestertius is magnificent!