I can't think of the right symbols to use and I can't really draw.
As far as drawing is concerned - who cares? Personally I use stick figures. Provided you thought about it, it is the right symbol. If you have difficulty, try this. Close your eyes, deep breath and relax. Let your mind float back through your past and recall people you love, friends, Christmas, birthdays, parties, holidays, triumphs, pets, sport, good times. Now look at your Mind Chart words. See if you can connect any past experience, thought or emotion to any of the words. Make up a simple symbol to represent this connection and add it to the Mind Chart.