I used to print a proof sheet or have a whole roll printed into 4x6 pictures. Now I import into Lightroom to do basic developing and cropping where I can get an idea how to work each individual picture in a set. These are not actual proof sheets (I shredded those). These are basic images that I thought were interesting at first and second glance. I think these personally curated proofs are like another artist's personally curated 'sketch book.'