What is Reddit's opinion of The Leatherworking Handbook: A Practical Illustrated Sourcebook of Techniques and Projects?

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Your bag looks like the first bag I made. It has the earmarks of being made by someone who has experience sewing fabric and apparel. Fabric sewing and leather craft have many shared skills, but leather has stand alone skills that you will need to learn. Many crafters here have learned through on-line tutorials. I started with this book, which I would recommend. https://www.amazon.com/Leatherworking-Handbook-Illustrated-Sourcebook-Techniques/dp/1844034747. This book is also a wonderful resource for bag designers https://www.amazon.com/gp/product/9887710806/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1

https://www.amazon.com/Leatherworking-Handbook-Illustrated-Sourcebook-Techniques/dp/1844034747/ref=sr_1_1?keywords=valerie+michael&qid=1560309402&s=gateway&sr=8-1

I'm almost positive it was The Leatherworking Handbook by Valerie Michael. Very well done book.

This book has a section on making masks: http://www.amazon.com/Leatherworking-Handbook-Illustrated-Sourcebook-Techniques/dp/1844034747/