It's not very common to see a head like this. I encourage you to try it yourself, and make improvements how you see fit.
[23:23:53] <AndChat|700625> Blue eyes ultimate dragon best card
[23:24:29] <AndChat|700625> You know the one with 3 heads
[23:24:39] <~Lightningkid> just like my dick
[11:35:40] <box> Hampa suck
[11:36:21] <hampa> not the first to tell me that today
Try searching for sewed mouth at google
You can get some examples there and try work with it i believe some have made it a toribash head and a friend has one i think i will check and repost later
You weren't very specific in what type of sewed mouth you were looking for, so i am going to assume you want a ragdoll styled sewed mouth.
It's actually quite simple.
You start out with a horizontal line curving depending on whether you want him to smile, frown or just poker face.
Then simple either add curved x's along the mouth line, or simple curved vertical lines.