I don't know what your hand looks like Esther, but when I do what I described, it is obvious that the hand is folding right across because that is the base of the whole knuckle pattern. It's not merely flesh bunching up; it's where the actual first knuckle bend properly appears on the inside of the hand. In comparison, most 3D figures I've seen seem to treat the first set of knuckles as entirely part of the fingers rather than essentially as a unified group at the base of the fingers.

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