I did this as an exercise for a project that might come up in the next week or two.
This is on A3 hardboard that I covered with black gesso and then sanded smooth. Afterward I gave a couple of coats of rattle can clear. Paint is E’tac Marissa colours and airbrush was my Eclipse. It really is an awesome gun.
It’s not the my best quality but I tried to cut the time spent on it to fit in the budget.