I like it, i know how hard it is to work with necron legs having done a similar project. Nice job on the lighting. Nice rust. But the rest is kinda boring. Color in the eyes and breast plate wouldn't hurt.
Nice sourced lightning, and a good rusted metal look.
However the base is too simple, cause a necron itself is already close to boring ^^
find something good for the base and I´d rate it 8-8,5 :)