Good photography of mannequins can increase sales in clothing stores by showcasing the clothing in an attractive and realistic way. Here are a few ways that good photography of mannequins can help to increase sales:

1. Highlighting the clothing: Good photography can help to draw attention to the clothing on the mannequin, showcasing the details, textures, and colors in an attractive way. This can help to make the clothing more appealing to customers and increase the likelihood of a sale.

2. Creating a sense of realism: Good photography can help to create a sense of realism, making it easier for customers to envision themselves wearing the clothing. This can increase the perceived value of the clothing and make it more appealing to customers.

3. Showcasing different styles and outfits: Good photography can help to showcase different styles and outfits, giving customers a sense of the range of clothing available in the store and helping them to find items that suit their individual tastes and preferences.

4. Creating a cohesive visual narrative: Good photography of mannequins can help to create a cohesive visual narrative that showcases the store's aesthetic, brand and style which can help to increase brand recognition and customer loyalty.

5. Inspiring customers: Good photography can inspire customers to try new styles, trends or items that they may not have considered before, which can increase the chances of a sale.

It is important to note that the mannequins used in the photographs should be well-proportioned, well-dressed and well-posed in order to make the clothing look its best. Additionally, lighting, composition and editing should be carefully considered to make the photographs as visually appealing as possible.