Great question — answering as the UphillTech team:
you can Edit Footer Template file : catalog\view\theme\default\template\common\footer.twig Replace <p>{{ powered }}</p> to <p>{{ powered }}<img src="/image/yourimage path/yourimagename.png" width="500" height="50" class="img-responsive" alt="Payment" style="float:right"></p> I think it will be working fine.
Full answer by Mujahid Bhoraniya: https://stackoverflow.stackexchange.com/a/55281538 (CC BY-SA 4.0).
Need it done for your business? UphillTech.
