Step 2: Define the facial features
To start sculpting the face, use the Move brush to work on the overall shape of the face and with the Clay brush, roughly block in where the features are going to sit in relation to each other.
The character's face in the concept is quite stylized, which means we can take a few liberties with the overall proportions of the head and position of the facial features. I'm going to be varying a bit from the concept art, but I still want to try to make her look interesting.
At this stage, it's a good idea to begin establishing the planes of the face. Use the Clay brush to create the cheeks, brow and jaw structure, making sure to check the shapes from different views. It helps when sculpting female faces to keep the transitions subtle and soft.
Step 3: Work on the lips
I tend to jump around the model a lot, working a little on each feature and then moving to the next. This helps keep the forms consistent and working with each other. For the purpose of this tutorial I'll concentrate on one feature at a time.
When sculpting the lips, start by roughly defining the upper and lower lips with the Move and Clay brushes. Use the hPolish or Clay brush to lightly flatten the upper lip, and the Move and Clay brushes to pull out the lower lip and create the overall shape of the lips.
Use the Clay brush to bring back some 'fullness' to the upper lip and define the philtrum. The DamStandard brush can be used to define where the upper and lower lips meet, and to define outer border of the lips, but keep it subtle! It's important to note that the lips sit on a curved surface, so make sure you are not sculpting them flat.
The upper lip can be broken down into 3 simpler shapes and the lower lip into 2 simpler shapes. The upper lip overlaps the lower lip and there is a small, subtle mass at the corner of the mouth that sits above the upper lip. Keep in mind that the subtleties of these shapes vary from person to person.
Step 4: Create the Nose
We'll move on to the nose next. Use the Clay brush to roughly block in the bridge of the nose and use the Move brush to shape the bridge and tip of the nose, checking from the front, 3/4 and side views.
Use the Clay brush again to build up the side wings of the nose. The DamStandard brush can be used to carve in the shape of the wings. Use the Clay and Move brushes to carve in the nostril, or alternatively you can mask the nostril shape on the underside of the nose, invert the mask (Ctrl + click on document background or Ctrl + I) and the use the Move brush to drag the unmasked polygons upwards into the nasal cavity.
For this character, I wanted to create a shorter nose and kept experimenting with the shape and position of the bridge, wings and the tip of the nose until I found something I liked.