The following sites are great image sources for any type of creative project. Each of them provide an excellent range of resolutions suitable for either web or large scale print. Use them for your coursework projects and presentations. Feel free to add suggestion in the comments.
Focus of this post, in order to give a bit of credit for the images on this site, is the #fantastical
Pixabay: 1 million+ Stunning Free Images to Use Anywhere
Why are some images free?