How to paint Ultramarines Tactical Squad? Space Marines Warhammer 40k Airbrush buypainted 1/2

Resin bits and models: Paints used Vallejo Air Color: French Blue, Insignia Blue, Sky Blue, White, Black, Fire Red, Tank Brown, Scarlet Red, Gun, Vallejo Game Color: Black, Sick Green, Livery Green, Cold Grey, Wolf Grey, Dead White Citadel Colors: Rakkarth Flesh, Mephiston Red Vallejo Liquid Gold: Old Gold Other materials: Humbrol Decal Fix, Humbrol Clear Red, Humbrol Clear Green, Vallejo Decal Fix, glue Contacta Professional, Vallejo Glaze Medium.