Making seam-spanning mouth embroidery (Patreon)
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The first step is to draw the mouth on a test plush, preferably light in colour. Unpick the plush and scan the pieces, and it'll show you where the lines you marked were.
The next step is redoing it multiple times because it's almost never perfect the first time. Stitch out your test, mark the changes and repeat step 1. I had to redo it 3 times to get the mouth right here. Make sure when you line up your pattern pieces that the mouth is at the same point where the seams intersect.
The lines rarely angle/sit where you think they need to go. The bowing of the fabric will always distort your lines. The only way I get through is a tonne of trial and error.