Using pictures is a great way to support your presentation, but not all pictures are good to use for your particular presentation. Is the picture really relevant for what you are talking about? Is the picture not distracting from your presentation? Is the picture not showing things that are not relevant. For example a picture of a city with buildings, and on one of the buildings is a large logo of a competitor company will not be very well perceived by your audience. Pictures matter, choose them wisely.
