Balboa Publishing was a frontrunner, because most of their published books were in the same genre as my book. (blog.balboapress.com)
If you are not sure about what size is appropriate for your book, go to a bookstore or the library and look at a number of books in the same genre as your book and make notes on the range of sizes and see what you y like best. (elegantbookdesign.com)
I think choosing an artist who has been producing artwork in the same genre as your book is highly beneficial and a great recommendation when interviewing potential artists. (wiseinkblog.com)