This took me about an hour as a colour test for painting Ultramarines using the Scale 75 Artist paints. I really like the vibrancy you can get out of the colours and while it’s far from my neatest paint job I really like the overall effect.
Undercoat: Vallejo Mecha Black
Base coat: Scale75 Art Black
Wet blend blues: Scale75 Light Ultramarine / Cobalt Blue
Highlight: Primary Blue
Eyes: Art White followed by Crimson, then Citadel Contrast Blood Angels Red, then shade with Instant Arcane Purple
Gold: Necro Gold / Instant Arcane Purple / highlight Dwarven Gold / ultimate highlight Citrine Alchemy
Silver: Black metal, blended to heavy metal, highlight Speed Metal, shadows Instant Shadow Black
Rubber: Art Black, highlight Black Metal