It's a fun study, invasion stripes. Most P-51D's didn't have full invasion stripes applied until after D-Day/June 6th, so there wasn't quite the same rush as there was, say on C-47's that were painted the day before, with mops. Many Mustangs actually had quite neatly-painted invasion stripes, with rather crisp edges around the stars-and-bars. Other groups, like the 361st, actually taped off the stars-and-bars, leaving a very nice and crisp outline around the insignias (which was also done when OD/RAF green was applied to the top-surfaces).
Here's another P-51D-5-NA, though one of the very last produced, which was fitted with one of the early dorsal fin fillets while at the factory (only the very last few D-5's were manufactured with the fillet), rather than in the field using a factory-supplied kit. This photos were taken in mid-late August, and the aircraft itself had likely arrived in England in late July/early August, at which point invasion stripes were no longer being painted on, but black and white identification stripes were still being applied (the same as reduced invasion stripes). So in the case of this aicraft, it never had full invasion stripes. (This scheme would make for another great repaint, using the model for "Marie")