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.
Still not sure which word to use? Choose a picture and take a look through the many choices! This graphic has excellent pictures to go with the information and I think that really help gets the point across. Anna comments: expansion of vocabulary