Adding images really brings your webpage to life. The syntax(code) for adding images is:
<img src="Image Name (eg washington.jpeg)" width=300px height=200px></img>
A great resource for images is pixaby. But when you download the images, make sure you save them in the same folder as the html file!!! Also HTML supports the JPEG image type on most browsers so try using those types of images.
This is an example of what you can do with images: