Modeling/Art non-related to Amnesia / SOMA

[The chaser]

I think you are talking about normals. The normals are what determines if a face looks inside the model or outside (normal). The "inside" normals are usually used to make closed environments (houses, caves, etc), while the outside normals are used for... well, you know. The normal models.

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Plus, the tongue is visible in the picture but not in the model (just what i see). It would be good if you showed us the tongue