Hi fbit,
Almost anything is possible and our Themer’s Guide outlines the basic steps required to customize views (emails included) for all of our plugins, so that is definitely worth reading in the first instance.
In this case it is the tickets/email.php template you would be interested in changing, so copying this to your theme and making the changes there would be the way to go:
themes/YOUR_THEME/tribe-events/tickets/email.php
Whether you wish to hard-code images in there and vary which displays according to the ticket name, or actually create a full fledged UI to define this in the admin environment when editing events (which would be far more complex) is up to you, but both are possible.
Does that help/give you something you can explore further?