Better and better!
I think the rear fuselage still looks a little boxy, especially at the junction of the fuselage and the tail cone (at the tip of the fin fillet). Thin the highlighting out a little and run it back all the way to the horizontal stablilizer. I think it helps to get a better feel for the shape of a P-51 rear fuselage by looking at one of the early Ds without the fillet.
Remember, the fillet doesn't cover the full width of the fuselage.
The spinner gap is a little too big. I'm struggling with the spinner gap, too. I've tried narrowing it down to a one-pixel gap, but then it doesn't look right any more. Maybe I've just gotten too used to how it looks.
I'd tone down the ribs on the rudder and make it a slightly different color, too. It was the only fabric surface on the Mustang, so it shouldn't perfectly match the rest when done in bare metal.