Question: Planning on writing a picture sci-fi book about Utopia.
The book will not have a plot (story), sequence or any conclusion. It will have approximately 30 illustrations generally depicting a search for Utopia, accompanied by minimal text for each illustration. Similar to a photo book.
Has anything similar to this been published before?
Could this spur sufficient interest?

Answer: 
I upvoted the answers about writing for yourself and noting what you find interesting. Go over and make mental note which areas you tend to skim over or feel confused on. Sometimes it take a few cycles of reading, editing and rereading before realizing a section needs to be cut out or changed.

As for the subject or the story. If it interests you, then you're going to enjoy it a lot more and likely put more effort and work into it than if you don't care.

The downside is (at least with me) is that I know so much about my story world so things may be clear in my mind but not clear to anyone outside. I'll gloss over ambiguous areas, things I need further research on to make it convincing, or things over explained, repetitive, etc. That may be when having a friend or some other person reading and giving feedback is helpful.

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Edited to add, while it might be socially awkward at times, I find talking about my story to other people (anyone willing to listen) helps me get an idea on a number of things:

1. How to get to the point (which helps me clarify in my writing and figure out the main plot/ theme). The first few times I do this, I tend to be all over the place rambling about everything and every little detail. That's a sign I need to figure out the point of the story, the main plot and possibly weed out unnecessary things.
2. Find out which parts interest the listener the most. What times do they seem really engaged or say "Wow that's a really good story."
3. Find out what areas they scratch their head and be like "You've lost me." or "Wow there's a lot going on. or I can't remember who is who and all those names. (this is a problem I'll have to sort out.)
What is interesting to the reader completely depends on the reader (the targeted and reached audience). For instance, people at a library will like different kind of books than people commuting by train.

The only way to know if people find your book interesting is to let people read your book (or parts of it, and then hope it represents the full quality of your book).
Let 10 people rate your book (chapter) on a scale from 0 = most boring stuff I've ever read to 10 = most interesting I've ever read. Let 10 other people rate a book with a similar amount of pages. Don't disclose which is your book. Then perform a T-test between the two groups.

If you're targeting a wide audience use popular narrative techniques. You might look at popular recently publicized books for techniques and constructs.

If you're targeting a niche audience, use in-group language and technical terms. Communicating with an in-group language that is understood by the reader gives a sense of belongingness.

If target audience is only one person writing an interesting book is the easiest. When there are 2 or more persons there will always be disagreement.