We don’t currently have any resources on customizing the ticket email (though we will definitely aim to develop some) however the tickets should indeed be formatted in a presentable form right out of the box, they certainly shouldn’t appear as plain text emails.
If that’s what you are experiencing it could be worth checking with your service provider (Amazon SES in this case?) to see if formatting is stripped for any reason, or if the plugin you are using to mediate between the two does so.
It’s also worth testing how it looks using different email clients as, unfortunately, a reality of HTML email is that there is a not inconsiderable amount of inconsistencies between different clients.