Hi Grf,

Yes this is possible. You can simply add an image to a report like this:

<img src="/your_module_name/static/src/img/yourimage.png"

Simply inherit the report where you want to do this and add in this code.
If you'd like the image as a footer you can either inherit the footer report (template id external_layout_footer) or you can remove the header and footer from your report by removing the following line from your report:

<t t-call="report.external_layout">

Regards,
Yenthe