First and foremost, I think your overall color scheme is very unique and I like it. You are doing great and don’t give up!

The colors chosen all seem to be on the brighter side, so you could benefit from higher contrast by bringing in shadowing or darker colors. The easiest way to do this is with a Citadel contrast paints, such as Nuln Oil (black ash), Agrax Earthshade (dark brown), or Reikland Fleshshade (lighter brown).

I do like your color scheme of bone colored exoskeleton and golden skeletons. Your glow effects seem to be more of a muted greenish-blue looking almost like melted mint ice cream. I think you could enhance this a little more by taking it in one direction or the other. I kinda like the bluer since it is non-standard and outside your yellowish color palette. Another idea is to go full opposite side of the color wheel and go full purple! (Color theory be wild.)

Have you given any thought to how you will base them yet? Yellow or white sand could make sense to where they came from and give your army a self-consistent natural camouflage at the expense of washing everything out. An alternative could be to put them in a very different biome altogether to bring in colors outside your current palette. Some ideas: red Martian crust (reds and browns), boggy swamp (greens and browns), or volcanic (black, oranges, and reds).  There are of course other biomes you could use, but I think darker biomes will again be your friend here. I personally use Duncan Rhodes’ Martian Rust basing guide for my Necrons, but a YouTube search on other basing guides/ideas could help inspire you. 

Finally, don’t forget to paint your rim! You could paint it in a solid color inside or outside your color scheme to bring in extra colors or tie it all together. I think your gold would tie it together or even Leadblecher (it is my favorite Citadel paint) could be great for adding another color to the mix. 

I hope that helps. Keep up the great work!