There are several websites where you can sell pictures that you have captured online. Some popular options include SmugMug, Dreamstime, EyeEm, 123RF, Foap, Zenfolio, Pixieset, Shutterstock, Stocksy, Adobe Stock, and Zenfolio. These websites offer different types of sales platforms, including exclusive and non-exclusive sales, and offer varying royalty rates. Some websites, such as Etsy, allow you to set your own prices and create a branded page to display your photos. To get started, you may need to submit a portfolio of your work and apply to become a contributor on the website. It's a good idea to research each website to find the one that best fits your needs and goals as a photographer.