Hey! Good sketches :D The mouth on the character to the right looks a bit strange because you’re drawing it as if the face were slightly in a 3/4 view, while the head itself is facing more toward the front. So, the drawing was mixing two different perspectives. The woman’s mouth isn’t really wrong, you just need to push the structure of the face a bit more while keeping in mind the volume of the mouth area (the teeth, muzzle area, and so on). The arm of the character on the left was also a bit too small. Hope this helps!











