That Marine's Dream is a modern paint job purporting to be the markings of Ken Wash. However AFAIK, Walsh never actually flew (or at least was never officially assigned) an aircraft with markings remotely resembling that bird. It certainly falls under "fictional."
The original Marine's Dream (in the same decal sheet as "Vargas Cowgirl") was an F4U-1 (Birdcage) BuNo 02576, MoDex 576, of VMF-222. I BELIEVE the "officially" assigned pilot was Ed Oleander, NOT Walsh. Walsh's machine was 02350, White 13. Even late in the war, when Walsh was flying 4-Hogs, his official machine appeared to use the White 13 MoDex. The artwork was also QUITE different from the FG-1D depicted in your image, featuring a slightly different pose, (the girl isn't supporting herself on her hands) and the girl was in a two-piece with bared midriff. The coloring has been a subject of debate, but photos of the actual aircraft suggest the woman depicted was actually a DARK-skinned blonde (either well-tanned Caucasian, or possibly a fair-haired Polynesian/Islander).
The historical ship was apparently in blue-gray over light gray two-tone, however there's some evidence that the wing uppers had been repainted in the semi-gloss sea blue used by tricolor Corsairs (from the research I've done, while the fuselage of tricolor Hogs used non-specular paint, the wing uppers used a semi-gloss. Presumably the semi-gloss provided better aerodynamics on the lifting surfaces over the non-specular?). Notably, the machine appears to have a lighter vertical stabilizer. It's commonly depicted as light gray against the blue-gray uppers, but I'm wondering if maybe this machine was actually a tricolor bird, and the upper fuselage had simply badly faded (which was quite common of Marine Corsairs in the theater. Sea "Vargas Cowgirl," the demarcation between the sea blue and intermediate blue is very difficult to pick up). The aircraft IS also known for a very unusual, very light-colored exhaust stain on the port fuselage that's been widely been misinterpreted as a high demarcation line in the camo.
This is a profile of the "real" Marine's Dream done up in two-tone, based on the "dark-skinned" art:
And the wreck of the real bird after a landing accident:
You can definitely tell from this that the girl is fairly dark-skinned.