Its kind of easy if we start drawing with guidelines. Follow my step by step pictures.
Step1:Draw a basic circle to estimate face shape and size.
Step2:Draw the division lines for eyes,nose and mouth.
Step3:Go ahead and draw the face features you wish to bring out in your drawing.
Step4:Give all the possible detailings to your drawing and complete the rough sketching part.
Step5:When you feel your drawing is satisfactory, then start inking it in black.After you finish with your inking part, erase all the pencil lines.
Step6:In my case i have used my pencil to give slight shades.Thats it, you are done with your inked drawing.
Hope you enjoyed it.Thank you.
