If you are looking for a reliable guide to master pen and ink techniques, the book " Pen and Ink Drawing: A Simple Guide
Stippling: Using tiny dots to build up tone. It’s time-consuming but offers the most control over gradients. penandinkdrawingasimpleguidemobidownloadbook better
Everything You Need to Know About Pen & Ink Drawing in One Simple E-Book. If you are looking for a reliable guide
MOBI is primarily for reading, but you can convert it to PDF using free software (like Calibre) if you want a physical copy. However, most users find the digital zoom is better than printing. Lines: Straight, curved, gestural
Focus on Fundamentals: Emphasizes understanding tone, texture, and value to create depth and realism, rather than just copying, says Alphonso Dunn's YouTube channel [1].
Art instructors praise the book because it teaches seeing, not just copying: