1. Spray White Scar
2. Paint scales in Volupus Pink
3. Highlight with Emperor's Children and Fulgrim Pink on scales? (maybe too light?)
4. Dark panel lining between scales (black? maybe just Carroburg Crimson ?)
5. "Flesh" recesses (e.g. on guns) in Magos Purple ?
6. Claws in Akhelian Green with Thousand Sons Blue layer and Ahriman Blue highlights?
7. Shade white body (clean up with Bold Titanium White if needed) with Soulblight Grey

Other ideas at some point

1. Guns in Nazdreg Yellow with Averland Sunset layer and Buff highlights? NO

Alternative / simplified

Aiming at this but pink:
https://www.warhammer-community.com/2022/03/30/codex-tyranids-evolves-the-hive-fleets-biggest-living-weapons-into-monstrous-vehicle-killers/
https://www.warhammer-community.com/wp-content/uploads/2019/06/ApocFF_Tyranids-Jun25-ArmyShot25dg.jpg
https://warzonestudio.com/image/catalog/blog/Death-watch-preview/Deathwatch-codex-04.jpg
https://www.warhammer-community.com/wp-content/uploads/2022/03/6ogiiFnBjZsB3WcP.jpg

1. Scales and claws in pink, with highlights
2. Light purple ( Magos Purple ?) guns, deeper purple "recesses"
3. Shade white body (clean up with Bold Titanium White if needed) with Soulblight Grey
4. bases as Astrogranite Debris with light grey drybrush