Hi Alex,
Aeromaster sheet no. 72-027 contains decals for a dragon marked P-38. It is claimed to be named Haleakala II and flown by Lt. H. H. Sealy. It has 12 on the tail. An early Microscale sheet, 72-172 also covered the same airplane. Decals for the mouth are given but the modeler must paint the dragon and the dotted outline himself. The mouth is shown in red by Microscale and black in Aeromaster. Based on your photo, Aeromaster would be more accurate. As complicated as the dragon was, I would guess that not many, if more than one, was painted that way.
EDIT!!!
I just checked an old Squadron Book, Aces of the SW Pacific. They show photos of Walter Duke, Maxwell Glenn, Harry Seely and Willard Webb, all from the 459th. They all have Dragons painted on their aircraft. Duke's airplane was named "Miss V" in the photo.
Obviously, several airplanes of the squadron had the dragon. HTH.