I didn't start out wanting to make a doll. My goal was just to dip my toe into sculpting a face for amigurumi creations.

With this in mind, I began by just making a doll head. From past experience, I knew that a basic head is a ball with some increases for the cheeks.

I grabbed some yarn (Camilla 6/4) and a 2.0 mm hook and started to make a head.
(I used the free pattern provided here as my guide.) 

With skin color, working from top of head, down: 

1: Into magic ring 6sc

2: 6 inc = 12

3:  (1sc, 1 inc) * 6 = 18sc

(NOTE: I like to count my stitches using multiplication like this: 1/2 (the increase) 3, 4/5 6, 7/8 9, 10/11 12, 13/14 15, 16/17 18 ... this way, I know when to increase and when I'm at the end of the row)

4: (2sc, 1 inc) * 6 = 24sc

5: (3sc, 1 inc) * 6 = 30sc

6: (4sc, 1 inc) * 6 = 36sc

7: (5sc, 1 inc) * 6 = 42sc

8: (6sc, 1 inc) * 6 = 48sc

9: (7sc, 1 inc) * 6 = 54sc

10: (8sc, 1 inc) * 6 = 60sc

11: (9sc, 1 inc) * 6 = 66sc

12-23 (12 rows) = 66sc

24: (10sc, 1 inc) * 6 = 72sc (cheeks) 

25: (11sc, 1 inc) * 6 = 78sc

NOTE: 

26-29: (4 rows) = 78sc

30:  (11sc, 1dec) * 6 = 72sc

31: (10sc, 1dec) * 6 = 66sc

32: (9sc, 1dec) * 6 = 60sc

33: (8sc, 1dec) * 6 = 54sc

34: (7sc, 1dec) * 6 = 48sc

35: (6sc, 1dec) * 6 = 42sc

36: (5sc, 1dec) * 6 = 36sc

37: (4sc, 1dec) * 6 = 30sc

38: (3sc, 1dec) * 6 = 24sc

39: (2sc, 1dec) * 6 = 18sc

Stuff the head 
Shape/sculpt the cheeks/eyes and then embroider a mouth. 

Stuff more, as needed.

Check out my  learning curve blog re: sculpting the face 

I experimented with a few different sculpting techniques, as the original goal was just to figure out how to make a good looking doll face.

Basically, to scupt the face, I ended up with this: I threaded a strand of yarn from right eye, to left corner of mouth area, to left eye, to right corner of the mouth area and pulled until I was happy with the results.
 

And this is where I thought the journey would end. But, I have a head. What should I do with it? Take it apart? Leave  floating head sitting on the shelf? 
"Well, Debbie, you've gone this far...." I heard that little voice say and I continued on with making a body.