Good instructional design involves an analysis of the learner. We should ask, "Does this instructional design match my students' learning styles"? Use this infographic to reflect on various learning styles.
You already know you don't want to read a speech verbatim from a screen or notes. You could memorize the speech word-for-word, but not everyone is able to do that—and it isn't natural. Instead, use "key images" to remember your important points.