As this Wikipedia biography notes, Bama graduated to illustrating covers for paperback books, including more than 60 for the Doc Savage series, perhaps the commercial work he is best known for.
But during the 1970s he had left New York City for a small town near Cody, Wyoming and successfully transitioned to painting Western scenes.
Bama always painted in a realistic style, though his style varied from hard-edge to slightly softened, depending on his needs.
Below are some examples of illustrations from the years he was getting established. Most are a far cry from what he produced later.