Because a 5-star rating might imply perfection, I hate to give 5 stars to any book. However, while this book is not perfect, its virtues are so great (especially in comparison to most other painting-technique books) that it deserves such a high rating.
Macpherson's first book, "Fill Your Oil Paintings With Light and Color," is also excellent. With this new book, and its beautiful paintings to illustrate the text, he expands on painting landscapes. Both books are very useful.
If I were to criticize, it is that, very occasionally, the book introduces a thought that could have been more fully elaborated. And potential buyers should understand that the book does not go into great detail on how to paint specific aspects of landscapes (e.g., clouds, water, trees, etc.); and that seems to be intentional. Rather than address brushstrokes, etc., this book goes right to the heart of things, to concepts that will more fundamentally improve how one paints. (I'm talking here about concrete, practical advice, not metaphysical fluff.) Such principles can indeed be found in some other books, but this book states them more clearly, and with better illustrations, than any other book I can think of. This book keeps one's focus on what is most important to a successful painting.
In short, this is a substantial book that makes many other art books seem rather superficial, or at least unclear, by comparison. This book will probably not obviate the use of specialty books (e.g., on painting clouds)--of which there are some excellent ones--rather, this book will give you the foundation on which to better apply the advice of those other books. As you can tell, I like this book. I suspect it will be regarded a classic.