Very nice job for such young modellers; my first models were far from being that beautiful.
zuluecho, don't try using th airbrush at once on a model; make trials on a plastic sheet first, figuring out pressure settings and distance. Also, always keep your hand moving when using an airbrush, to prevent from having too much paint and drops on some areas. Keep your airbrush clean too; use thinner instead of paint to clean the inside, and also air from the compressor hose.