Watch the video. sorry for the poor quality but I am new at this..
Step 1: SETUP
Layout your drawing.
Step 2: Dem Holes
Sketch out your eye sockets.
Step 3: Nosy
Now work ou tyou nose cavity notice the use of the setup line for the bottom of the nose cavity.
Step 4: HEADLY LAMAR
Now you add the layout of the skull and lower jaw. Dont worry you can erase as you go. we all make mistakes you will to, thats why eraserse were invented.
Step 5: Hmmm Looking Good
Add basic shading and work over any mistakes you find. Rework and cleanup to finsh the job
Step 6: Dead Head
Step 7: FINISHING TOUCHES
NOW FOR THE REST OF THE STORY
I am adding a hood for a Grim reaper look and shading my but off here. I use the smear control to make the colors flow. This takes a little while to get use to, but it works great.