You want your website to look wonderful, but you cannot just take images from other sites, and some stock photography is really expensive! Here are sine great resources for free stock photography!
Pexels has a great supply of free Stock Photography. This is a great resources, with over 3,000 and with 70 a week being added.
They also have many stock videos.
All of this is shared under the Learn more about the Creative Commons Zero (CC0) License. You can use, edit or change the without needing permission, or referencing the source. These are available for personal use and commercial projects. The images and video are not watermarked.
Canva.com has stock photography with a twist - its a tool that allows you to easily create "posters" for social sharing. Adding text, layers and more could not be easier. The service is free, some of the images are free, some cost a small amount of money - but its very clear what is free and what is not. An excellent resource to help your social marketing.
ReciteThis lets you chose a free background, and put your text over the top of it, for social sharing. This is another free service. Unlike Canva (above) ReciteThis uses more drawings than photographs.
Another great resource for eye-catching promotions.