Steve - the cat's looking really sharp so far! Definitely dig the fading/splotchiness you've got going on on the wings.
A few suggestions, mostly out of stuff I've been considering for my own tricolor builds. Granted, I haven't done one yet, so don't take me as gospel or anything close!
- Fading out the decals a bit more, especially on the wing.
- Filters to mess with the tonal variation. I think some gray, blue, and maybe even some raw umber (at least on the bottom) could do curious things and help give that splotchy look you're going for.
- Airbrushing filters of white or very light gray. Like 9:1 thinner to paint.
- Gloss coat, then flat coat, then strategic wet sanding with 1600-2000 grit sandpaper. Again, all about the tonal variation, or in this case, reflective variation. Used this one completely inadvertently with my Dauntless build last summer (Polly flat spat white flecks everywhere and I didn't know the "shoot it with gloss" cure at the time), and it came out pretty great: