How do I project my own picture?

You can project almost any picture on the screen.

However, if you want it to be transparent – then the picture needs to be in .PNG format, with a transparent background. I explain how to do that here: https://www.desktoplightboard.com/2020/08/22/adding-a-transparent-picture-obs/

Alternatively, you can make the picture with a black background, and then use the Luma Key filter.  I explain how to do this in the PowerPoint demonstration.