It's like making a meal for a rather large number of people. Did I forget the toast points? I'm fixing the captions today and adding some acknowledgments to my excellent editors and to the very very kind reader, who revealed his name (you will find out). I also need to fix my author questionnaire and think about who will puff it. I say puff rather than blurb, because technically a blurb is actually the description of the book on the jacket. A puff is someone's salesmanship of it.
Happily Minnesota like actual discussion of images in captions. There is quite a lot to say and I can understand how with 23 pictures, many in color, someone might rifle through the book and look at the images. You want the captions to say something meaningful.