Firstly, it's important to avoid using copyrighted images without permission, as this can constitute copyright infringement and lead to legal issues. The best approach is to obtain explicit permission from the copyright holder to use the image, ideally in writing. This ensures you have their consent and can use the image legally.
Alternatively, you can seek out images that are licensed for free public use, such as those available through Creative Commons or on stock photo sites. These images are specifically intended for use without the need to seek permission, as long as you follow the terms of the license (e.g., providing attribution). Familiarizing yourself with the different Creative Commons license types and their requirements is crucial when using these images.