Check the rules under the "fair use" regulations in the copyright laws for your country and the nature of the images (figures, tables, photos, etc.). Generally, if you limit your use of the images and if the work is for educational purposes and will remain unpublished, copyright law counts it as "fair use". Do check your own uni's handbook, they might have particular rules. Also, your uni's library website should have information about copyright law.
Hope that helps a bit.
Livvie