It depends on the terms of use for the specific website and the stock images that you want to use. Some websites offer a selection of stock images that are free to use for any purpose, while others may require that you attribute the image to the creator or may have other restrictions on where and how you can use them. It is important to carefully read and understand the terms of use for any free stock image website before using the images in your designs.Some free stock image websites may not have a wide selection of high-quality images, so you may need to purchase a license for more professional or specific images.