Since you are using the snowball technique for your geese, and have now learned to sew slightly left of the drawn line to allow for the turn, try this tip, too.
Trim out ONLY the middle layer of the small square (not the corner of the background rectangle) leaving a 1/4” seam allowance.
The background rectangle is already correctly squared up, and that allows you to accurately match whatever adjoining segment comes next, if you haven’t trimmed it away.
Jan in VA