I made some similar comments in the Mustang GB thread, but here goes:
The P-51H is a pilot's/engineer's airplane if not a museum curator's. I think you have to appreciate the unusual lines of the P-51H on a different level than first appearances. Because the engine had 30% more HP , the aircraft fuselage had to be lengthened for better lateral & pitch stability (rather like the later P-40s). The radiator shape was blended into a more aerodynamic profile with the aft fuselage, greatly reducing drag from an air-circulation region that existed on the D-model. The cockpit was raised for better FWD visibility over the nose for more accurate deflection shooting, making the nose appear more sharply pointed. All of these changes made the Mustang a better airplane, and so they are beautiful in my opinion. This Mustang works in closer harmony with the laws of physics, aerodynamics, and air combat manuevering.
I would imagine that the true beauty of the aircraft was demonstrated from the pilot's seat when she was put into her motions at 450MPH. About the time that you got out of the cockpit and looked back at her on the tarmac, I expect that she would look like a supermodel.