It depends on how tall you are. Anyway, our senior high school math teacher used to write a picture on the blackboard. Although it is slow, the students look very clear and easy to identify. Don't be blind because of poor handwriting, so that students can't understand it. It is estimated that you should learn running script. I recommend you to read Wu Yusheng's running script copybook. He teaches the radicals alone so that you can learn better. You can read his words online first, Tian Yingzhang.