I agree with Cassius that these portraits leave a lot to be desired, but that's a good find regardless. Thank you Charles!
The portrait of Horace is especially interesting. He is depicted not only as a boy, but as a free-born minor wearing the age-appropriate Toga Praetexta. Horace was free-born, which is a point worthy of note since his father endured some years of slavery.
He is also depicted with a bay leaf (or laurel, from bay laurel), which signifies poetry. In fact, Horace did not write poetry in his youth; he turned to it in later years after choosing the wrong side in the Roman Civil War and losing his father's estate in Venusia as part of Augustus' land seizures. Since Rome did boast a number of boy-poets--among them Lucan, died age 25, and Catullus, died age 30--it might seem an unusual choice for a portrait of Horace who lived to be nearly 60. Personally, my favorite portrait of Horace depicts him bald and squat, in middle age, with a glass of wine and a winning grin.