How I painted the Hydra colour scheme, part of a larger video on painting a variety of Tyranid Hive Fleets.

Skin

1. Start with a black primer, I used a cheap spray primer for mine.
2. Cover the whole skin with a layer of Kantor Blue .
3. Wash back over with Nuln Oil .
4. Pass over all of the skin with thinned Kantor Blue , relayering the skin but leaving some of that wash in the recesses
5. Highlight up with Calgar Blue .

Note: For characters, you might want to add a dot highlight of Fenrisian Grey for extra punch

Inner Flesh and Weapons

1. Carefully pass over all the splits in the skin and joints, as well as the weapon, with Daemonette Hide . If you overspill, cut back over with your previous blues as necessary. Might get quite messy, but stick with it!
2. Wash all those areas with Druchii Violet
3. Relayer any ridges in those splits with Daemonette Hide and a thin brush. The weapon wants a relayer and edge highlight with this, leaving some shade left in the recesses.
4. Add an edge highlight of Warpfiend Grey for some sheen.

Note: For characters, you might want to add a dot highlight of Slaanesh Grey for extra punch

Carapace, Claw and Hooves

1. Block in all of the carapace, claws and hooves with black, I used Matt Black
2. Glaze toward the back of each plate with Eshin Grey . If you're not confident with glazing, you can either drybrush or relayer entirely with Eshin Grey if you'd prefer, the idea is to get a hint of colour under the patterns.
3. Carefully draw on striation lines with Dawnstone . I pick a spot and draw the lines toward myself when doing this, evenly spacing where I can but not worrying if they're not - It's meant to be biological, and biology is rarely perfect!
4. Add a second line highlight with Administratum Grey on the striations

Note: For characters and monsters, a point highlight of White right at the edge of the plate where the striations meet will add a bit more punch

Weapon Details

1. For a bit more variation I blocked the flesh cables and splits on the weapon with Screamer Pink . This is an optional change to the scheme, I just wanted a bit more differentiation personally!
2. Wash these details back with Carroburg Crimson .
3. Highlight up with Screamer Pink .
4. Highlight again with Kislev Flesh .

Eyes and Teeth

Note: As this goes along side a video tutorial on a wider range of Hive Fleets, I'm using pictures of 'Gants that aren't Behemoth. Colours are all the same though!

1. Layer over the whole eye with Averland Sunset
2. Relayer again with Yriel Yellow . It's quite easy to run out of control on these small areas, so take your time. I found that adding a wash into the socket and trying again with Yriel Yellow works well if it goes nuts and I don't catch it in time.
3. Then coat all the teeth with Rakarth Flesh
4. Wash back with Agrax Earthshade
5. A quick highlight/relayer with Pallid Wych Flesh , leaving some of that washed Rakarth Flesh near the gum line