the top one just looks like the colors are airbrushed onto buttercream and then the outlines are piped over it after. I'm not sure about the bottom one. It looks kind of like airbrushed/painted on crusted buttercream...
just my 2 cents
looks like to me they are airbrushed and then outlined or outlined and then airbrushed.
Those are beautiful! I do agree they look airbrushed/outlined.
Airbrush? really? wow, what a talent!