This is really looking nice!

Paint Dept Time
Thanks for following along and the nice comments fellow modelers @tcinla, @johnb and @luftwaffe-birdman.
After getting sidetracked by that yellow Stearman I just posted in the headlines last week, I'm back on my Desert Air War project.

Paint Dept here I come, testing out some new preshading ideas. I painted the entire A-20 flat black for starters:

Great preperation, Eric @eb801
This will for sure create some nice shadings.

The Paint Shop
Ok. Let the fun begin, starting with the undersides using Vallejo Air UK Azure Blue thinned an additional 25% (although Vallejo already is packaged thinned and ready to go but it does need a bit more). And by the way, I am taking my time with the painting and not banging this out.
Looks like my preshading idea worked but I don't know if one can tell by looking at these photos.

1 additional image. Click to enlarge.

Glad you're following along, John @johnb. I know what you mean about Vallejo drying out and clogging one's airbrush. I have found a couple of drops of paint retarder seems to help. Unfortunately the photos I uploaded backfired on me and I got a notice saying I made a "critical error" so I have no idea what I did wrong.

@eb801, after creating my Vallejo mixture, I add a bit of 'flow improver', 1 drop per 10 of the mixture. Maybe that is a short of retarder as well. At least it does improve the painting process.

TC @tcinla - I also like Tamiya acrylics and the correct thinning mixtures which I think after all these years I am getting close to dialing in, no small thanks to your suggestions. Vallejo works just as well for me, now that I have the learning curve down. It's Ammo MIG acrylics that give me fits and I don't want anything to do with them.