If you are still trying to get the knack of GW’s contrast paints can I recommend a couple of things.
1/ paint the lowest layer first and then touch up the higher layers with whatever colour you have used as the undercoat. I often find that if you leave the lowest layers till last you end up leaving white spots in the corners and mucking up belts and sashes.
2/ try to do higher layers in darker colours. So sashes and belts usually end up in dark brown, black or dark blue. This helps hide some of the over painting you need to do with lower down (and usually lighter) colours.
3/ have a play with putting contrast paints over different base colours, including silver. You can get some very cool coloured metallic effects by putting bright contrast colours over shiny silver, and can get a very nice dark oiled metal look with black contrast over bright silver.
My hobby plog over on Yaktribe covers my pretty basic attempts to paint Necromunda gangs where I had started with pretty bad ink painting and have ended up with a bit of a hybrid model or traditional and contrast painting that works.
https://yaktribe.games/community/threads/almic85s-general-hobby-plog.8882/post-266000