Diagrams and Drawings
Diagrams are good for showing the inner workings of an object or pointing out the most important or relevant parts of something. Think about diagrams as blueprints that show the inside of something—for example, key bones in the human body in a speech about common skateboarding injuries. Diagrams are good alternatives to pictures when you only need to point out certain things that may be difficult to see in a photograph.
You may even be able to draw a simple diagram yourself if you find it would be useful during your speech. Although not all maps are simple enough to be created by the speaker, many maps can be hand drawn during a speech or ahead of time to indicate different locations or patterns. While I would recommend that you anticipate this ahead of time so you can incorporate a more professional version of the diagram created with computer software or more precise drawing, drawing a diagram on an overhead projector, whiteboard, or smart board can be useful.