PHOTOSHOP: Retouching is an art for professionals (using their photo for marketing) and photographers who want the best color/focus mangement possible. There are more ussues aside from 'looking better naturally'. Shadows which hide information, dirty whites, greenish yellows, glare, dropping saturation without loosing color richness are examples.
Fixing dental, hair, neck, eyes, color to show wardrobe details.
This is a simple retouch; cutting glare on glass, eliminating wrinkles on eyes and neck, lowering facial shadows, adding more color to face and hair.
When budgets aren't available for dynamic photography a composite is within possibility.
Adding product to background, elevating shadows and highlights