If your wanting the entire head in focus on a closeup shot... your gonna have to stop down your lens. You will need to change your apature to f/20 or higher. By doing this you are reducing the amount of light that his hitting the sensor and you really dont want to slow down the shutter speed to much because then you risk blur with body movements. You will have to use a flash on these shots.
Best advice I can give on this one... is to play with the settings till you get the look your after. Id start around f/16 and work my way up to whatever your lens can handle.
Now if your wanting closeups like this one
you may need to buy more equipment. With this shot I was using a Tamron 28/300mm macro lens, 1.4x tele, and a small extension tube so I could physically get closer and still be able to focus.
For that shot above I was using an external flash. My shutter was 1/200, ISO 400, apature f/22, Focal length 300mm.
Even at f/22 I didnt have enough depth of field (DOF) to get the whole face in focus. In order to get the whole face in focus I would have had to stop the lens down even further... maybe f/32
Hope this helps... if not... I'll try to answer anymore questions I may have caused