PAINTING: Take two squadrons into the air? I just wash and go!

I did this painting a few days ago but I have only just got round to photographing the results.

I washed the metallic parts of the Thunderbolts with Badab Black and then slapped some Devlan Mud on the red tails and darker camo stripes.

I'm dithering over the highlight stage now. My normal process after the basecoats and washes would be a highlight layer but I actually quite like the muted, matte finish on the planes at the moment. I'm considering just adding some identification markings and calling them done.

I also washed my Ork planes heavily with Badab Black. This went over the whole model, red and metallics. Again, I think it's given the models a more subdued, gritty look which I'm digging, but I feel guilty for not completing the process.

When do you know how to stop painting a model anyway?

Comments and criticism are welcome!