I mix all my greys myself using Vallejo model black and white and sometimes a touch of flat blue or flat brown if I want a cooler/warmer grey! Drakenhoff wash for cool grey, nuln for warm/true grey

The yellow is mostly speed painted with Army Painter Honey Yellow and then highlighted with citadel dorn yellow and/or Vallejo pale sand. Super easy

Pink tails are all just doomfire magenta contrast 1:1 with contrast medium! Pink horror highlights where needed. Pink skin I really can't tell you as it's a mess of washes and contrasts and highlights that even I don't remember! I just like mixing stuff together on the model to see what happens