Portrait of the Abbot of Lamennais Paulin Jean Baptiste Guerin (1783-1855)

The picture has something of this: portrait, people, man, music, wear, retro, cross, musician, face, facial hair, mustache, son, light, jacket.
Perhaps it’s a painting of a man sitting at a desk with a quill in his hand and a quill resting on top of a piece of paper.