Help with body lines, Can you clarify what this is supposed to look like? Options

[ThePaintedMan]

Hi guys,
Now that I've got some time to work on the car again and waiting for news about the heads, I'm going to try to tackle some of the bodywork. Below are some photos of the rear end, which definitely has seen contact at some point. I need to figure out what is bent and how everything is supposed to line up.



First off, is there supposed to be a "valley" here? Or should it be flat, parallel to the ground?



This picture shows the rear panel itself. Is this supposed to have a slight curvature across it? And for the lower section, should that be completely flat? Or should the bottom edge of it be closer in to the body than the top?



Finally, I'm not sure about the tail lights. The right side has obviously been hit, but I can't tell whats wrong with it. Should it be flush, like the left side? Or should both the tail lights protrude a little when viewed from the top?

Thanks for the help! Sorry I had to post this, I haven't been able to find a good example nearby to look at or any pictures that showed what I was curious about.