You might want to spruce up your poster by adding images or content by someone else. This is fine as long as you have permission to use the content.
Reusing another person's work without permission isn't recommended and may even be a copyright violation.
To make sure you're using materials responsibly, we recommend limiting your searches to content that's been openly licensed, allowing you to reuse it for free.
One easy way to do this is to keep any eye out for indicators that something has a Creative Commons license assigned to it. A Creative Commons license might still place some limitations on where and how you can reuse something, but it gives you a lot more flexibility.
Here are three places to start your search for images you should be free to reuse in your poster.
This content was taken from Musselman Library's Digital Humanities Toolkit
Whenever you include an image you didn't make, you need to add a caption that provides credit and attribution.
Creative Commons recommends including the following information in attributions: