After only painting for a year, I have been frustrated about color/light/shadows in my paintings. I've ordered a few other books, and Amazon notified me that other readers have ordered this book. I checked the ratings (5 star) and actually just ordered the book based on that!
Imagine my delight to discover that while the book IS further along than I am, the light is finally dawning on me with regard to painting .... thank you for those reviews - they were right FIVE STARS

Kreutz has compiled a superb collection of problems and their corrections. Many of which can carry over to watercolour, acrylic, pastels etc. On the back cover is a list of topics which is very useful when you become familiar with the book. I find myself looking at the painting, not quite sure where the fix is, work my way down the list mentally assessing which corrections might work.
If you like art in the style of Rembrandt, Caravaggio, and Chardin then you'll find plenty in here of interest. I read of a complaint about the photos not being in focus. For the most part I would say they are in focus - look at the signature and how crisp it is. Kreutz might be painting in a looser style than what some folks are used to. There are 2 or 3 pictures which could be considered out of focus but they get the subject matter across.
100% Recommended and well worth the money.