Your situation is not as unusual as you might think. I have had similar clients too. Yes, multiple. In my experience it isn't mental illness, just totally diso

Your situation is not as unusual as you might think. I have had similar clients too. Yes, multiple. In my experience it isn't mental illness, just totally disorganised. Key management are probably jumping around and never completing anything. If you look around you might see that your project is not the only one that is being stalled by people not delivering their components. There are two things that you can do. Put everything in writing. Ask for the images, CC the relevant manager and the stakeholder. Give deadlines and specify the consequences of any delays on their part. The second part is to invoice weekly and itemise all the extra work you had to do to chase late delivery of material. AND make sure you get paid on time. If you don't get paid time, send them a warning and then follow-up with a letter (hand-delivered if necessary). If that doesn't work then FIRE the client. You can only put up with a little aggravation without getting paid. If they want to be jerks, make them pay for the privilege.