Step #1
Start the tutorial work by drawing rectangle & shape for the upper body .
Step #2
Draw outline for hand & legs.
Step #3
Draw outline for lower face & ear.
Step #4
Make hairs .
Step #5
Make glasses, lips, nose & eye brows.
Step #6
Make arms, hands & upper body dressing.
Step #7
Make pant & legs.
Step #8
Draw retinas, triangle over the head, coat & tie.
Step #9
Finally, make necessary improvements to finish.