Want to share with you way how can you add Сustom Image on Acumatica form.
To do that you can use PXImage control. In the ImageUrl you can add physical path to image on the file system.
<px:PXImage runat="server" ImageUrl ="~/Icons/login_logo.png" />
This is static image and not linked with any data view or dac, so if you need to change images dynamically you have to write logic in the code behind file however it is not recommended way by Acumatica standards.
Have a nice development!