Let's me share the experience I made using some drawings for a sale demo presentation given to an customer audience . In this demo, instead of showing pre made demo slide to my customer I built slides by scanning on them the drawings that reprensented the main customer processes and the way the solution could enhance them . Thanks to these drawings I got more intimacy with the customer, I obtained more personalization, more transparency and more value : they recognised their processes and were able to check better my understanding of their needs. They were more confident to ask question and to share their goals and say what was important for them .On my side I was more confortable to comment and discuss about these slides that I really produced on my own rather than discussing about slide coming from my company's external services (Marketing, Business Development...) 
