I will tell you the name of the book I used to make these blocks after I get better at it. If I told you now, you wouldn't buy the book, but I really do get better, and the book I used is really great.
I just need more practice here.
I think it is unbelieveable that I made this block the same day I made the others. I think the principle here is that smaller curves are easier to make. I use a varigated pink and white thread here.