Mermaid doll Composition

Using a thick thread and attach the parts firmly.

Neck

Stick the wire of neck into the head.

Fold the seam allowance of the neck and stitch it to the head.

Lower body

Put the body into the fish.
Fold the allowance of the fish cloth inside.
Whip the hem to the body.
Paint the waist with the same color of the fish.

Arms

Refer to Kimono doll's too.

Sew the opening of the arm and tie the thread.
Cut the extra wires and wrap the tips with a plaster.
Make a hole on the shoulder and stick the wires in it.
Stitch the arm around to the shoulder.