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Samdoo
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"Hey dude, you've recently uploaded a bunch of really cool Halo Wars imag..."
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Recently, a bunch of artists from Ensemble Studios all decided to upload a shit ton of HW stuff. No idea if it's to do with NDAs expiring or what, but I'll provide their links so you can have a look yourself.

Hope it helps! There's some super cool stuff there. Searching artstation for Halo Wars or Halo in general is a good way of finding cool stuff like this.