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What pencils did you use for the sketches in your answer? Can you share links to the books about sketching?
Choosing a size for Sketchbook. a5 would be apt. It opens to a working are of a4, Where you can create small intricate sketches to detailed ones. T are convenient to use and easy to carry. If you like drawing on a big scale, a4 would be helpful. It opens up to a size of a3. For me, Time matters. It takes at least 1–2 hours for completing the sketch. a3 would take much more time and will need a bigger bag to carry it. Then there are smaller sketchbooks like a6. Those are extremely portable and you can even fit them into your pocket. T are light and great for carrying anywhere. Switching sizes is a good way to mix up your style and help you think different.
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I'll be following up some comments.