They do look nice. If I may forward a suggestion, the omnibus sides would look the part with bold advertising slogans for BLACK'S OYSTERS or STONE'S GINGER TONIC, or what have you.
Also, from what I've read, omnibuses were seldom empty
There was also a fellow, called a "cad", on the rear step, who collected the money and advertised the presence of empty seats (whether or not there in fact was any space to be had). Judith Flanders'
The Victorian City had this all kinds of nice details about the city in Dickens' day.