First thing to do is write down in the middle of a blank sheet of paper a certain theme or subject that your work is based off of. Circle it then write down all over the sheet anything that relates to what you circled. The more you have to write down the more you’ll have to talk about. For example, if you have a series of paintings of underwater wildlife, you would write down “Underwater Wildlife,” circle it and then maybe write things like “Beautiful, Fun, Scary, Coral Reefs, Earth, etc.”
Down below is an example I did for my current work these days.