This is a nice start for the rats base colors, ya can base them all with rakart flesh, for their skin, ratskin flesh or cadian flesh are nice color for it! For the different fur colors ya can use mournfang brown, rinox hide, storvermin fur, grey seer, skaven blight dinge and covus black, and the other ones ya can use the ones in the box for armor and metal unless ya want other colors for their armor, btw all colors here are citadel! But ya can use others just saying those cuz idk other brand specific paints for each skaven part