The Rust Spot are quit easy. A Brown Base Coat, the with airbrush hairspray over the hole area. Then salt on the wet area. After that with an Airbrush the "real" Base color and High lights. Then with warm water and a soft brush you rub the salt off.
At last high light die spots.
Look in youtube for good instructions.
the color is freaken AWESOME! how did you do the rust spots :D!? the only issue i have and why i didnt give a 10 is the base, not a big fan of it, and doesnt really go with the theme of the color, maybe aquatic base or like corrupted grounds, all n all you make me wana start cryx and do a similar color scheme xD