Modeling/Art non-related to Amnesia / SOMA

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but I would say go 2048 anyway since you can always just scale it down.

Yup, that too. Always start at least one texture size bigger than what you want to use in the end. (Unless you're pixeling a low res Minecraft texturepack ) Makes detailling so much easier and also you never know when you might need a high-res texture! Scaling down always works after all, scaling up not so much...