No, signature no match. You make mistake in your signature? You change name? Add letter? C'est ridicule ça. You must have noticed Artprice does not list any Dupoint. Pieter Dupont was a well-known Dutch draughtsman and etcher who hardly ever painted and certainly not a frivolous scene after François Boucher. Your painting is a nice mid 20th century copy, annotated in French 'par Boucher' and signed in an unmistakably FRENCH hand-writing by a French copyist whose name is irretrievable.