Curtiss H-81a (Tomahawk Mk. 1 / P-40B) Possibly flown by Robert "Bob" Layher (reference photo is signed by him), flight leader in the 2nd Pursuit Squadron "Panda Bears", American Volunteer Group "Flying Tigers" during the first half of 1942. The "Panda Bears" primarily saw action in China while based at Kunming, but also saw stints in Burma during January and May.
#46 is only one of two Flying Tiger P-40's I can say with reasonable certainty had the blue outlined shark mouth. The vast majority of the artwork and models of planes with this feature turned out to have black outlined shark mouths in reference photos. Unfortunately, All that is shown in the photo of #46 is the nose, so markings are depicted as what was typical of known 2nd PS aircraft - although the inclusion of the "Panda Bear" emblem on the fuselage side is artistic license on my part, as it seems they rarely panted their emblem on their planes, unlike the 1st and 3rd squadrons.
