Turning sharp collar points: http://off-the-cuff-style.blogspot.com/2012/10/perfect-collar-pointsa-shirtmakers.html?m=1
If it’s tricky – don’t despair! You are not alone! https://sewingontheedge.blogspot.com/2019/06/sewing-shirts-stress-free-way-collar.html
And Barbara’s guide: https://sewingontheedge.blogspot.com/2019/06/sewing-shirts-stress-free-way-collar_15.html https://sewingontheedge.blogspot.com/2018/10/on-process-as-well-as-product-and-how-i.html
Drafting a shawl collar http://en.inthemoodforcouture.com/how-to-draw-a-custom-shawl-collar/
to the touch 