Are you using the bias tape that irons on and then you sew it? I think it is from Clover. That is how I did my last large stained glass. As others have said be sure all the pieces butt together and be aware of the overlap before sewing down anything because some leading will have to go under other leading. You can see on her hair, I had to do the long parts of her hair first, as the short parts had to cross the tops of the long parts. That sort of thing.
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Watson