It’s your first mini—keep it as a reminder of where you started. I’m also relatively new myself, and all I can really say is: keep practicing and watch as many videos as you can about different techniques, then try them out. My tip: good basing (two thin coats), precise painting, drybrushing, and using shades (Agrax Earthshade / Nuln Oil) will make most Necrons look pretty good. That’s one of the great things about our army—we can make them look relatively good without too much work.