I'm unsure on where to post this so I'll do it here. I`m writing a report and I want to add pictures to convey several ideas. Just asking generally, how do you usually make those pictures? Say a picture of an electrical circuit for the experimental setup, or a picture of a fcc-crystal arrangement or artist-impression picture of what the atoms in your sample are doing during some physical process. I used to use windows paint for undergraduate reports since I didn't care too much whether it was pretty then, but I want it to look professional now without stealing pictures from other people everywhere. Any help is greatly appreciated.