Wow I think your brush painting beats airbrushing. All the other ones I've seen that use airbrush have this kind of grime or irregularity on their paint when they finish, but yours look extremely clean.
The Mitsubishi factory paint color for the A6M2b was "Ash Green" (Hairyokushoku) on the authority of Jiro Horikoshi, there is no dispute over the color scheme, except among the uninformed.