Contacts · Posters · iOS 17.1.1

So, just so I have this straight, I have had photos for all my contacts in my iPhone, and now with the addition of 'posters' I cant simply use the same photos I've had for years and have to go back and find the same picture or a new picture for each and every one of my contacts if I want a 'large poster' photo when they call me? If not, then just a monogram will show up?