Using native Quick Base you can make an alternate form with the information and layout you need for a customer quote, and then create a Notification to be triggered by say changing a checkbox to send that form to the customer on that form. That type of Notification is called an Open Notification as the receipient does not need to have a Quick Base userid. That would be a form in HTMl format and will look like the form you see now when viewing a record in Quick Base.
There is a way to include images in the form.
Alternatively, if you want to create a real PDF to send to your customer, there is a 3rd party add on I can recommend called Exact Forms Plus from Juiced technologies. It will allow you to create a real PDF including images and embedded subtables for your quote line items. There is a demo in the link below.
https://www.juicedtech.com/exact-form...