Mark, regarding your comment about free handing camo. I've been at this hobby for many decades, 6+, and from experience I can say there are so many variables in getting free handing dialed in.
The airbrush needle/nozzle size, psi, paint type, thinner ratio, distance from the model, etc. It took me quite some time to get just a bit comfortable with it, then as I progressed gradually I felt more confident.
Now I make my mixture, and then make several test lines and patterns, just to see how the paint flows on, then make my changes to the mix until it works for me.
So, while you are already well advanced in skills, free handing is the area to really put in some experimenting and practice. Really enjoy seeing your work so far, if you feel like it let us see how your free handing comes together.
Patrick