On stock photo sites, many photographers and illustrators try to do the slide design work for you and create ready-made compositions. Often, they are not very good.

The one below for example. It requires a lot of technical skill to make it, but somehow the colors and the look and feel do not seem right. Also, the concept is a bit forced. You could equally show the 2 logos of the joint venture partners on the last slide and you convey the same message.

And worst of all: because these type of images have been over-used so much in bad presentations, putting one up will immediately make your audience assume that this presentation will fit into that category.