From the Cornell Copyright Information Center: interesting copyright info. Did you know the rules about copyright of architectural works?
Be careful with books and pictures. You are not so likely to get in trouble with buildings.
We do offer you remote access to an incredible image service for public library patrons. Image Quest by Britannica. They have millions of gorgeous pictures that you can download and then use for non-profit, educational purposes. To explore just log in with your library card number.
Of course you don't need to have a school report due, or even be a student, to log in and have fun. Enjoy art? Try a search on "light micrograph" There are over 6 thousand images in that single category.
Finding beauty in science and science in beauty is certainly quintessential STEAM (Science, Technology, Engineering, Art and Math)
If you do use Image Quest pictures in projects (and we hope you do), be sure to cite them properly.