ratchet, do yourself a favour, and get rid of the seam in the middle. Nobody accept a model ever that has a seam in the middle like an old puppet made of plastic.
Import it in blender, duplicate it without changing the coordinates, make a new uv-layout, and bake the texture of your model to the model with the new uv-layout. Twice, once for the color texture and once for the normalmap.
Second, learn the proportions of a face, copy the faces with the pencil, even the simple of the following examples: drawing cartoony faces drawing faces