This is a good overview of the subject and is readable - if you know you want to add a certain 'something' to your sewing projects but are unsure where to start it will help you focus your ideas and introduce you to a range of techniques and approaches.
It's not in any way a book of projects for you to work along with -- absolutely fine in itself but as a result there are relatively few photographs of the process, or even the end results, of the techniques being described. Take the "Beading" chapter, for example - there are quite a few photographs of loose beads to illustrate the "materials" section but in the 28 pages devoted to "methods" there are precisely four photographs with, for the most part, very general captions like "Bead embroidery can add character to most any garment.". It's virtually all (bar one section on a netted fringe) text and stylised line drawings, with no photographs to show what the results look like in real life.
I think that this book would be improved by going down one of two contrasting routes: either going into more detail in illustrating the range of techniques it does include or keeping its overview tone but expanding its subject matter to cover a more encyclopaedic range of techniques -- at present, for example, there is no goldwork, no cutwork, no drawn thread embroidery or decorative hemstitching. As it is, I enjoyed it and came away with several interesting ideas but also with a feeling of vague dissatisfaction.