If they cannot see your images they might not understand your speech as well. Let's assume you have come up with some good demonstration speech ideas with food but don't know which one to pick. Ideally when you finish your speech, you'll find yourself on the receiving end of question after question from eager listeners wanting to know more.
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Merely speaking is okay, but what if your audience has a hard time catching up? Have Good To make a picture frame, to do a magic card trick, to draw a cartoon animal, to kick a soccer ball, to do origami, to make flowers out of tissue, to make a ribbon necklace, to make a friendship bracelet, to play indian poker, to play basketball, to hit a volleyball, to make homemade gatorade, throw a baseball the right way, to knit a crochet, to braid hair.
Sometimes a professor tells you that before you even get to writing and sometimes you need to figure this out by yourself.
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If you succeed in convincing and persuading them it would be great. You can improve the way you talk, move and look while babbling your speech.
How to learn to play the guitar. You should consider the severity of your speech and whether or not your audience easily understands it during the presentation.