The oversized headline and the form already carry the weight, so the empty right side reads as breathing room to me. If it ever feels bare, a small line like office hours or typical response time near the form could fill it without competing with the photo.
Features section from Byline, a concept PR agency site. Off-black and white base, one red-orange accent for a breaking news feel, and a hover state that fills the active card. Built in Framer.