If you're doing this for artistic reason, the effect can be fantastic - a greyscale scene with a coloured dress, red gore, striking eyes. Firey explosions and muzzle flash in The Matrix seem extra bright and striking because so much of the movie is Monochromatic, Near-Neutral or Dull Colours.
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Bolder & Chainsword
- Don't go overboard.
- Contrasts can be lost quickly if you paint too much of something.
Ex: A black and white scene with red blood dripping from claws can look intense. But if you paint red gore all over, it'll just look messy.
- Contrast details, not generic elements.
- Pick details that are worth accenting. Skin, jackets, armour and such probably aren't worth standing out. Eyes, gems, a beautiful dress, hair, special effects, blood, tattoos, mirrored surfaces and so on.
- The reverse is also true.
- You could take a normally painted scene, then paint an area Neutrally to dull it or mute normally shocking visuals like blood. This would make the rest of the scene stand out.
Alright, I Cheated
painted for the Achromatic example and throw some contrast on it.
I mixed some bright (Blood) red in with some pouring medium to give it a little body and gloss. This gives me some nice bright and thick fake blood. Too bright to be realistic, but great if you're trying to be bold.
When I paint it on him, I used a cheap brush like I always do when working with mediums. The obvious place for the gore is his axe and where it would drip down. I also painted some splash across his chest as a spray of blood. For effect, you don't really want to create a "real" spray of blood. (Fine mist, Dexter-like, etc.) Just some solid contrasting areas.