The bright deer eyes, the cute little button nose, the weird out of place eyebrow line thing. Who the -blam!- approved this and thought it was even remotely fitting for the game??? When put next to any other enemies in the game it’s a pretty joke like design.
EDIT: I’ve seen some opinions that have made me reevaluate my stance in the comments. I still think it’s a little out of place for the setting and would have personally preferred a darker aesthetic, but it seems that the oddness of it is what most people like and I can’t argue that it’s weird and different.
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It’s literally just a more science fantasy-ish gray alien. There’s nothing wrong with the Witness’s appearance. I think the whole point is for them to look uncanny and weird.