I made a poll which Primarch I should draw for Slaaneshmas/Sanguinalia/Christmas and since Fulgrim, Dorn, Guilliman, Curze and (believe it or not) Perturabo already had their spotlight last Christmas, Sanguinius won very clearly.

So here are both versions of him (as Euten states in "Unremembered Empire" his hair- and eyecolour change with his mood) - blonde and dark haired.

Vektorprojekt: Sanguinius.
Keine Sorge, wir sind bald durch, es kommt noch einer und dann dauert es vermutlich Monate, bis der nächste fertig ist.
Sangus Flügel haben mich viel Zeit und Mühe gekostet, aber ich hatte wirklich Spaß daran :)

Feral Sanguinius from Mahaute's Planet-Swap-AU-fanfic.
He was raised by predatory monsterbirds and is clueless about civilisation.

It's a very good fic and I'm so excited for the next chapters (I already got some teasers. Like Mobster-Mournival, Diplomat-Sevatar and such. Sounds very great!)
Please read it, because it's very good and Fanfiction is the best thing the Warhammer-fandom has to offer!
https://archiveofourown.org/works/41683488