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The problem is not really size, but positioning of the features. Human face should have the eyes at centre height, top of ears connecting to face at the same level, and so forth.
The masked face by Yamaguchi follows that rule but the other one does not. Result of miscommunication or lack of basic sculpting experience who knows. Like the eyes should be around where the eyebrows are, and the rest shifted accordingly, less hair shown and such. The volume of the hood should be included as where the top of the skull should be but the maskless face ignores it completely.