Painting a one-color pet portrait onto an aluminum sheet

There was a reson for every airbrush used - The Eclipse Takumi for most of the actual painting. The Micron for any details that I couldn't do with the Takumi. The Paasche VL (with its largest spray head) for the Auto Borne so that I don't gum up my other brushes. And the AB Turbo for that unique way that it can do controlled spatter...