Prompt
                                        
                                            Generate a realistic image of a late 19th or early 20th-century British theatre architect, specifically William George Robert Sprague, in a formal attire, standing in front of one of his notable works, such as the Aldwych Theatre or the Noël Coward Theatre, with a slight smile and a confident demeanor, set against a backdrop of a bustling London street during the early 20th century.