Learn here on this site about all modeling and animation projects working in Maya. This specific tutorial is about patch modeling of face in Maya. We are working in Maya 2010, so you also use same version of Maya. Split the viewport setting into orthographic viewport and view the model from different angles. Take polygonal cube and use it for patching. Take start from nose from front viewport at Y-axis. In this situation, the object manipulation tools are used tremendously.
This cube is moved with move tool, go to side view and rotate it with rotate tool so that it set along with nose shape. Use congruent tool to split this basic cube and then extrude it from different angles. Extrude another cube side from starting cube and rotate it in side viewport for cheek and face.
Increase the face patching according to facial shape, taking different cube from extrusion. Now extrude the cube from top side and increase it toward eye and forehead. Create map of eye setting along with eyebrow.
The basic patching will be though little bit rough so reset it from extruding and rotating the cube for complete geometry of face modeling. Unhide the reference image for a while and see half of the face modeling is created and other side can be created with copy method. From this video method you can get useful directions about face patching modeling.
https://www.youtube.com/watch?v=nv6vUGJLEEU