Cockpit technique looks good. The subtlety works well, just a hint can go a long way. My only suggestion would be to flatten out the curve of the reflection half way up the canopy. From memory, the Mustang bubble canopy bulges outward slightly, so the reflection would be nearly horizontal, or more inline with the lower frame.
Rivets look good.
Whoa! I'm wrong about the canopy, see attached!
Nice work, Gamary, I can't see any of the other problems you mention.