I bought this book wanting to learn more about classical glazing techniques, as I have always painted alla prima. Unlike the other book on painting flowers using glazing techniques, this one is genuinely helpful in understanding what the author does. Regarding another review that the paintings themselves are bad, displaying no understanding of edges and value, I suggest you look yourself, since I would disagree (the weakness is edges, I agree, but even there she does show awareness in at least some of the paintings). The main issue I have, as was pointed out by an american reviewer, is that this book does not give you an understanding of classical glazing techniques at all, but actually demonstrates using oils as if they are watercolours. She does not do a grisaille, she paints from light to dark like watercolour (glazes always darken, but normally you would separate value from hue/chroma by using a grisaille), and doesn't use white paint at all, but leaves blank canvas for white areas ('saving the white of the canvas' - sound familiar?). I know of no book showing classical technique applied to florals, as painters such as Rachel Ruysch would have done. I would have liked more on the issue that must face everyone starting with a glazing technique, viz: how do you decide which combination of colours to use, and in which order? But her follow-along exercises are do-able and give practical insight into her methods.
I don't want to give the impression that Arleta is under the delusion that she is painting in a classical oil painting manner, or wants you to think so. She is quite explicit about loving the transparent colours of watercolours, but was in search of greater depth and vibrancy, and found that by applying watercolour techniques to oil. My warning is in case, like me, you are looking to understand classical techniques.
So, if you want to learn about classical glazing techniques, or standard oil painting techniques, look elsewhere. But just because a technique originated in a different medium doesn't in itself make it invalid. I suggest you judge the results for yourself.