I love the sidewalk cams. The way they're set up is most useful for ID is in the daytime though. You'll have to disable the onboard IR (unplug it if they can't disable it in software) and add some IR floodlights to get better facial ID at night. That'll wreck your chances of getting plates at night unless you dedicate the cams to plate cams and hope to get lucky (not really long enough lenses though). Slightly larger holes or cams with a bit longer lens to peek through the existing holes would get rid of those black edges which don't help with your exposure.
To improve the driveway cam you'll need more light. Also, parking the white vehicle with the white light shining on it darkens the rest of the scene, but I don't expect a dramatic improvement even if you swap parking spots with the black truck but it'll help. That cam's not great at night anyway. Getting a good face shot from that cam when he was only there for a quick peek would be just luck anyway. No shame in that and the current cam is angled well to show a crossing shot of the yard for double duty. The lens is sized well to cover both vehicles with not much wasted to the sides. You'd hate to pick a longer lens and only cover 1.5 vehicles or maybe half of each. You might add a second driveway cam in the middle with better low light performance than the ones you've got.
Your front yard cam would really benefit from some more IR plus maybe a camera upgrade as well if you aren't happy with the picture after adding the illuminator. Get a big one that matches the FOV, not the little ones the size of a lemon, but anything's better than the onboard stuff.