Whip stitch the folded batting in place until the other end.
Sew the batting again to tail seam allowance about 1/4″ below the raw edge.
(Note: I used this method since stuffing with poly-fill to a long narrow tail is difficult and uneven.)
Insert finger into the sock and pull the tail right side out, portion by portion. Only turn the sock not the batting.
Repeat (2) until you reach to the end. Continue with the turning by inserting the batting into the tail until it fully gets into it.
Adjust the batting so that it looks neat. Fold the raw edge in and stitch it up just like the arms method.
Divide the body into half, with top half being the face of the monkey where eyes and mouth are sewed to.
You may want to decorate the felt eye with a line of running stitch with 6 strands of embroidery floss before sewing it on the face.
To make the eyes attach to the face closely, insert your needle as deep as possible into the face, turn and come out to another point of the same eye. Pull thread tightly so that the eye attach closely to the face.
Fold and baste the raw edge of the mouth, then pin it in place. Slip stitch around until you are about 1″ away from the starting point.
Stuff the mouth fully. Continue to slip stitch to the starting point to complete the mouth.
Embroidery branch stitches across the middle of the mouth. Tips: look out for the toe seam line of the sock, this is where the middle is.
Sew another arm with slip stitch.
If you think that the arms are not “sunken” enough, pass the needle to the other side, pull the thread to get the result you want, knot the thread securely.
If you are happy with it, then it is OK.