I reckon you've done OK in what look quite difficult surroundings. That's often the case with Registrar's Offices and even some churches. If there's a reception venue with better surroundings you're sometimes better off taking the bulk of the shots there, but if not there's not much you can do except try to make the best of a bad job.
I can see why you've done the vignetting on some of the shots, but I wouldn't get too carried away with it - I don't see a really good reason for it with the shot through the open car door?