I really appreciate all the suggestions!
I realized last night that I had sewed some of the inset pieces (which are made up of squares and triangles!) incorrectly. No wonder the design didn't look right :oops: I've spent the morning "unsewing".
I think that the black and white picture will really be a help. The drawings in the book are done in a deep blue and white, so they should look almost the same.
Now, if I haven't ruined the bias on the triangles by unsewing them........