Be careful when sealing the seam where three seams at the top of the shoulder converge, as it is bulky and takes careful working (next to the number 4 on the top).
I would also recommend drawing small pieces 1 and 2 on paper before cutting, as they are difficult to draw directly on cloth.
I cannot draw clearly how to attach the collar, but when I make another top in the future I will take a picture and explain it, as well as how to seal the raw edges.