Here are a few websites that you may wish to search for images. Remember to check and ensure you can comply with licenses or terms and conditions before any 3rd party images are incorporated in your work.
Additional sources compiled at:
If you’d like to use images, icons, or vector graphics in your infographic that were not originally created by yourself, you’ll have to find an open, royalty-free resource that provides images!
Like other intellectual properties, some data may come with constraints on their usage. Most data resources will make their usage restrictions clear and in educational contexts, most data can be reused and shared freely with correct attribution and citation, but this is worth paying close attention to while doing your research!