You can customize your printed tickets on an org, event level and ticket type level in your Backstage dashboard. You can add a Logo, a Banner, and an Advertisement.
Ticket Type Level
Tickets > Edit > Advanced Settings
Here you can add a Ticket Banner (Ticket Type Image), Ticket Logo, and Ticket Ad.
The ticket Logo and Banner are in similar locations but different in dimension.
Here is the workspace for the Banner and Ad.
Organization Level:
Ticket Settings > Ticket Logo
Event Level
Ticket Settings > Ticket Logo