Finding quality images for all this. Physics topics is not so easy and even those that I ended up using didn't quite fit.

• I think I've seen some authors draw by themselves to avoid violating the copyright issues. If you can't maybe you can attach some explanation video which can usually be found on Youtube.
• You should have cited the other references properly. Even if you were using notes or anything from your study, that would have originated from something right? The idea is to always recognise the effort made by the original author.