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I've taken online art classes on drawing and want to move my skills up to the next level of proficiency. I've just started using this guidebook.
Pros: It's well written. Exercises are useful and the author explains things well. I truly think it's worth purchasing.
Cons: Here's why 4 stars - Firstly, I'm surprised that the author does not address how to hold the pencil. (At least not as far I've got into the book) There are different ways to hold the pencil, but my point is that the way one holds the pencil to write is not the way one holds the pencil to draw.
Secondly, the exercises in this book should really be performed on a large sheet of paper. I've been taught that in learning to draw, one needs to get the whole arm involved ( just the hand and wrist motions are usually not used unless for fine detail) For each exercise, I took 18x24 newsprint (cheap paper) and did the exercises multiple times. I found this to be very helpful, especially for the beginning exercises.
I feel the author should mention this, or at the very least, the book should be printed in a larger format.
The sections on measuring and defining shape are great, but these need to be reenforced in the later chapters on shading and defining form. The section on portraits is a bit odd. It emphasizes placing a head into a box but then in the examples, reverts to the earlier methods. however it is still a great learning tool.