Having images on a website is important as it would look pretty dull if it was all text. Finding good images can be difficult to find if you're after something specific, and you then have to take licensing into consideration to avoid copyright infingement issues.
There are some websites like Unsplash which promise 'Beautiful free images and pictures' and these are generally very good, although you still have to be wary of copyright issues as you have no guarantee that the person who uploaded to the site held the full copyright to the image!
Another option which is becoming increasingly attractice is using AI (Artificial Intelligence) to create the image that you need. There are several suystems like Midjourney that allow you to describe the image you need and then it creates it for you.
If I was an art teacher, I would be looking very carefully at work that was submitted!