I am currently laying out a book (poetry). There are a few images to be placed at various points throughout the text. Most of these are portrait orientation. For various reasons it is necessary for each image to appear alone on its own page without any other element.
Is it acceptable to lay these images out vertically (taking up a full page for each one) so that the reader has to turn the book 90 degrees to view them? If I don't do this and lay them out in their natural orientation I am worried that a) they will be too small, and b) they will look a bit lost with too much white space above and below them.