Carcharodons drop pod door with airbrush!

Here is my first attempt at paint something with an airbrush.

I primed it grey and preshaded it with black and white, after that I´ve painted it with light grey and matt medium.

After airbrush I made some chipping with a sponge and a darker grey and I like the effect achieved.

After that I painted the bottom parts black to match with the carcharodons theme and chipped it with boltgun metal (now leadbelcher) and mithril silver (I don´t now its new name) and painted some spirts with agrax earthshade wash under every rivet achieving a nice old and used effect.

Comments and criticism are welcome as ever.