* Color Representation: The hand is often used as a neutral skin tone reference to give viewers a better idea of how the makeup will look on the skin. This is particularly helpful for foundation, concealer, blush, eyeshadow, and lipstick. People have different monitors/screens and cameras, so this is a reliable way to show the color.
* Texture and Finish: Placing the makeup on the hand can help demonstrate its texture (e.g., creamy, powdery, liquid) and finish (e.g., matte, dewy, shimmery). Swatching on the hand allows for a clearer visual representation than simply showing the product in its packaging.
* Size and Scale: Holding the product in the hand gives a sense of its size relative to an object most people are familiar with. This can be especially useful when judging how much product you get for the price, or if the packaging makes it look bigger or smaller than it is.
* Social Media Trend: Like many things in the beauty and fashion world, it's become a common practice and aesthetic on platforms like Instagram, TikTok, and YouTube. It's simply what people expect to see when someone is showing off makeup products.
In summary, while it might seem like a simple gesture, holding makeup in front of the hand serves as a visual aid to provide context about color, texture, size, and overall product appeal.