I'm on very shaky ground in commenting on art, but there doesn't seem to be enough room between the mother and the groom for the groom to appear as small as he does -- particularly given, as you note, he seems large relative the doorway.
In addition, our point of view seems odd. We can't be looking at them straight on, unless there are steps behind the mother leading down to the doorway, which would be a pretty unusual layout for a room. I guess we are supposed to be elevated a bit and looking down on them. Maybe there is a way to make sense of it, but it just doesn't seem well composed.
I know S&K scored a big hit with this title, but compared to our man Baker, a lot of the art sure seems weak to me.
Here's where this drawing fails. We see the ceiling which implies a low angle looking up, which is consistent with the characters, but the table looks like you're looking down on it from an elevation. The doorway should appear lower than the man from a low perspective. That and the table throws the drawing out of whack.