Half-length portrait of a gentleman Sir Henry William Beechey (1753-1839)

The picture has something of this: people, portrait, retro, man, jacket, vintage, wear, music, coat, necklace, outerwear, antique, famous, lid, musician.
Perhaps it’s a painting of a man in a coat and tie sitting at a desk with a pen and paper in his hand and a pen in his other hand.