Creative Commons licenses can be applied to images as well as to text content. When looking to include images in your work, make sure that not only is it open licensed and able to be reproduced, but also that you are including alt text to make the image accessible to all of your viewers. Alt text is what screen reading software reads out in place of images and is also what appears when an image will not load for a user on a very slow connection.
Sound recordings that have been published with an open license are more difficult to find than images, but there are still sounds, speech recordings, and even songs that are available to content creators for free. When including sound in your work, make sure to also provide captions or a transcript of the sound for those who are unable to listen.