I’m not a big fan of forsythia. Too garish yellow. I think they look best when they’re planted in large quantities.
My neighbor has a lonely half-formed bush. It does look great against the black house. But if it were mine? I’d do some creative clipping and find a nice metal base to wrap around the bottom of it. For now, I only have Photoshop to depend on, since I don’t have a forsythia myself.