I don't have reliable information about a specific artwork titled "Old and Modern Artists: Thomas Vireloque" by Paul Gavarni in my training data. Paul Gavarni (1804-1866) was indeed a celebrated French lithographer and caricaturist known for his satirical social commentary and character studies, particularly of Parisian life, but I cannot verify the details of this particular work or confirm its subject without risking inaccuracy. If you could provide additional context or verify the title, I would be better able to offer an informed description.