[MP&C]

In the bottom two pictures you show a low at about the 8" area on the rule. Sometimes when a "glancing blow" creates what I refer to as a "long" dent, in creating that high spot it pulled shape out of the surrounding panel. You need some off dolly, some upward pressure at those lows while tapping down on the high spots. The wider face of a slapper may be more effective over the smaller size of the hammer face.

I know you have the rule set up for the photo, but I typically lean the ruler over at about a 45* angle where it better conforms to the hood crown. Then it will be easier to visualize what areas are what..