I have a lot of books and I'm starting to run out of shelf space

. I've been looking at non-fiction ebooks and there are a number that interest me. However, all my non-fiction 'hard copy' books have at least one section of photographs. I wouldn't want to buy a non-fiction ebook that didn't have these.
Can anybody out there give me information on the presence (or absence!) of pictures in non-fiction books?