The same face can look dramatically different beside a window, beneath an overhead lamp and in a direct flash photograph. A change in appearance does not necessarily mean that the makeup changed. Often the light has rewritten the relationship between highlights, shadows and texture.
For a beauty portrait, lighting belongs in the look from the beginning. Leaving it until the end can lead to unnecessary layers of product applied to solve a problem that exists only in one setup.
Observe before adjusting
Make a simple test photograph in the intended position. Look at the forehead, cheekbones and area around the mouth as parts of the same composition. Notice where the brightest reflection sits and whether it pulls attention away from the eyes or the makeup detail you want to feature.
Then change one thing at a time: the angle of the face, the camera position or the placement of the light. Compare those results before deciding that the finish itself needs alteration. This is a visual exercise, not a diagnosis of skin or a prescription for products.
Keep the person recognizable
Soft light can produce a gentle transition across a cheek; directional light can make the structure more pronounced. Both are useful. The choice depends on whether the story calls for intimacy, graphic contrast or a straightforward record of the look. No lighting setup is a universal definition of how a face ought to appear.
Select the final image at a realistic viewing size as well as close up. A tiny highlight that seems overwhelming on an enlarged screen may contribute life to a normal portrait. The goal is not to eliminate every sign of reflection. It is to decide where the light belongs, and to let the face retain enough variation to feel like a face rather than a rendered surface.