The horticulture director Peter Joseph Lenne Karl Joseph Begas (1794-1854)

The picture has something of this: people, portrait, wear, man, neckwear, jacket, leader, menswear, facial expression, tie, outerwear, confidence, popularity, politician, outfit, administration, business.
Perhaps it’s a close up of a painting of a man in a black suit with a white shirt and a black tie.