Part of the problem is you’re not approaching this as a model, but as a 2D graphic. All the drawn 2D details that do not enclose an area, like the mouth, arms, jaw line, and feet are preventing a face from forming. In order to form a face, a bounded area must be free from impinging or protruding edges. The features I mentioned are exactly that: impinging edges.
I suggest that you rethink your pikachu as a 3D object in space rather than a 2D drawing on paper. Start with a solid base and gradually build up features in 3D by additive and subtractive operations. You can probably get away with the appearance of no shoulders in the creature by softening the edges that form the shoulders, but the arms should be contoured objects on top of the body, not just outlines within the outline of the body.