Draw a silhouette of a profile face with bezier tool. Fill it with #D2D2D2
Draw the hair using bezier tool. Select the face, Press Shift now select the hair. Click Trim. Fill it with #4F4F4F.
Draw the eyebrows using bezier. Fill it with #4F4F4F
Start drawing the eye on the left side. Use transparency as shown in the image below.
Draw an eye like shape .Fill it with #4F4F4F. Place it between the black lines as shown in the image. It should be placed behind the black lines. To place it behind the black lines Press Ctrl+Pg down (3 times or as much as needed). Use transparency as shown below.
Draw eyeball using ellipse tool. Fill it black color. Use transparency.
Note: dont forget to remove outlines.
Now we have to shade the surrounding areas of the eye. Draw the shape( as shown in the image), fill it with #787878. Apply transparency.
Now for the eyelashes: Draw one eyelash with bezier tool. Fill it with #000000 (black). Copy the eyelash to make "many" eyelashes. Keep changing its size after copying so that they do not look similar.
Now start drawing the eye on the right side. Copy the eyelashes adjust them. Draw the eyeball of the right eye too.
Now we need to shade the left eye. Draw a huge shape surrounding the left eye. Fill it with #636363. Apply transparency. To place it behind, Press Shift+pgdown, then press Ctrl+pgup. You will get it in the correct place i.e. just above the face.
Shade the eye using #4D4D4D color.
Now we have to shade the right eye. With bezeir start drawing the outline of the nose and enclose the space so that the right eye and cheek comes within the enclosed shape.
Select the recently drawn shape, press shift and select the face. Click intersect. We will use this intersection process in coming steps too.
Fill this shape with #000000 (Black) color and remove the outline. Apply transparency as shown.
Use the same intersection process to further shade the eye. Fill the shape with #696969 and apply transparency.
Draw a small shape below the right eye as shown in the image. This is for highlighting the cheek. Fill it with #D9D9D9. Apply transparency.
Now draw the nose. Fill it with #757575. Apply transparency
Draw the nostrils. Fill the color #4F4F4F
Start shading the nose. Fill this shape with #E9E9E9.
Reduce the size of the shape drawn in the previous step. Fill it white color. Apply transparency in opposite direction i.e. from bottom to top
Few more highlights and the nose is complete.
Draw a triangle with round edges. Fill it with #A8A8A8. Apply transparency
Shade the forehead
Highlight the cheek. Draw the round-edged triangle. Fill it with #ECECEC. Apply transparency.
Draw the upper lip. Fill it with #616161
Draw the lower Lip. Fill it with #787878
Start Shading the lips.
Shade the lower lip. Use intersection process to get the shape. Fill it with #4A4A4A
Highlight the lips. Use #C2C2C2
Shade the upper lip too.
Shade the chin with #999999
Some more shading. Use the bezier tool to draw the shapes. Fill this one with #616161. Apply transparency.
Expand the size of the shape drawn in previous step. Fill this one with #858585
Shade the jaw area. Fill it with #858585. Apply transparency.
Reduce the size of the shape created in previous step. Fill it with #616161. Apply transparency.
Create another shape for the cheeks using bezier tool. Fill it with #C2C2C2.
Remove outlines. Make it transparent.
Reduce its size. Change the color to #AEAEAE. Now the face is complete.
Similarly you can draw the neck and shade it.
Draw the hairs using bezier. You have to a single hair and copy it to make many. Change their sizes so they look different (just like we did the eyelashes).
I did not want to draw ear so I here is a headphone. ;)
Here is a clip of the face with no transparency and un-removed outlines.
Here is the Final image.