There are three kinds of books that count as animal (usually bird) guides.
1) A pocket field guide of the critters of a reasonably circumscribed geographical area, like the Peterson Field Guide to Birds of Eastern and Central North America. This is a small book that can fit in a big pocket, and a classic guide like this one is something you'll want to have with you while bird watching in the eastern or central US.
2) A big book, not suitable for pockets, of the critters of a reasonably circumscribed geographical area. A great example of this is The Crossley ID Guide: Eastern Birds . It covers the same geographical area as the aforementioned Peterson guide, but the book's authors and publishers sacrifice portability for other characteristics like richness of detail and more book real estate for many more images.
3) A book, larger or smaller, that focuses on a specific geographical area but covers most of the visible wildlife including, often, plants, and maybe including additional information for the traveller. A recent example of this is the just published Wildlife of the Galapagos.
4) A book that covers a large taxonomic group, but over a vast geographical area. Carnivores of the World is an example of this. It covers all of the non-aquatic carnivores, everywhere on the planet. This particular book is a pocket field guide, but in a way that is kind of funny because you'd have be on quite a trip to need a pocket guide for the Earth for a given type of animal. I quickly add, however, that while it might seem a bit silly, the Carnivores of the World is actually a fantastic book.
The book, Waterfowl of North America, Europe, and Asia: An Identification Guide, by Sébastien Reeber, overlaps with some of these categories. The title could be rewritten to say "Temperate and Subtropical Waterfowl of the Northern Hemisphere," though that would be a bit misleading because a large percentage of these birds migrate long distances, so really, it is more like "Waterfowl of the world except the ones that stay in the tropics or otherwise don't migrate north of the tropics," but that would be a silly title.
Also, Waterfowl of North America, Europe, and Asia: An Identification Guide is large format. The up and down and back and forth dimensions are not as large as Crossley's bird guides, but it is way bigger than a field guide, and thick ... 656 pages. The plates start on page 32 and the detailed text and photograph rich species accounts run from pages 177 to 616, to give you an idea of the balance and expansiveness found in this volume.
This book is organized in a unique way. There are two main parts. First, 72 plates show peterson-style drawings of all of the birds that are covered, with the drawings arranged on the right side, with basic ID information, range maps, and references to other parts of the book on the left side. This allows the user to find a particular bird fairly quickly. Importantly, the pictures cover both sex and age variations.
The second part of the book significantly expands on the plates, and is cross referenced by plate number, with extensive text and multiple photographs to add very rich detail.
So, when it comes to your preference for drawings vs. photographs, you can have your cake and eat it too. Also, when it comes to your need for a basic field guide vs. a more in depth discussion, you can have your cake and eat it too there as well.
Aside from these two main sections there are sections on how to use the book, basics of taconomy and systematics, the physical anatomy of birds and how that relates to identification, important information on moulting and plumage variation as well as age and sex, which as you probably know are key in identifying waterfowl because this varies so much. There is an extensive section on hybrids, which, again, is a big deal with many waterfowl, and a very large number of hybrids are addressed in the book. (There is a separate hybrid index.)
The book is extremely well produced and presented. I love this book.
Since Waterfowl of North America, Europe, and Asia: An Identification Guide is brand new, if you've got a birder friend or relative with a birthday coming up soon, this is the perfect gift. Meanwhile, migrations are underway. You need this book now.
For those of us in North America, the table top companion is newly published 2nd edition of the classic Ducks, Geese, and Swans of North America. It's a gorgeous, beautifully written, 2 volume encyclopedic treatise https://jhupbooks.press.jhu.edu/content/ducks-geese-and-swans-north-america
I was also going to mention the book Hunter mentioned above. It is an "update" from Bellrose's classic waterfowl book, although update is an understatement as this is now two volumes vs Bellrose's one book.
It is worth having. My one quibble with it is that they didn't reproduce the summary graphs in the new volume. Not sure why...they would only have taken a couple of pages...maybe they were just too generalized to be useful.
Looks like this new waterfowl book also has pictures of wings, speculum markings? That's handy. I have a separate book just aging and sexing ducks by wings, but I'd like something similar in an identification guide so I see it more regularly (not often I'll pull out my age/sexing book just to look at wing pictures...I still have good memories of doing those weekend marathon wing-bees going through boxes of wings to identify, age and sex the wings hunters sent in; that was early in my career before disillusionment about job prospects in the biology field set in :).
There was also this one from the same author late last year but having studied neither I cannot comment further. Is there overlap here?
I am interested as would be a grandson who is at uni studying zoology I know either/or both books could be right up his street. Grandad may have to pay though.