It is either 'built-in' to the texture (glossy appearance in the texture image) or you could try applying a reflection texture to just the lips. Problem lies in whether the lips of the model are a separate material. If not, this will not work (as expected).

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

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