if you are using arcgis pro, you can create your own layouts with logos, etc and publish them to arcgis server using steps like this: https://enterprise.arcgis.com/en/server/latest/publish-services/windows/tutorial-publish-additional-...
Hi Mariyana,
Here's another good step by step instruction on how to do this:
https://pro.arcgis.com/en/pro-app/latest/help/layouts/add-and-modify-graphics-and-text.htm
To find this answer I googled "add picture to layout arcgis pro".
Hope this info helps you now and in the future. 😊
