Julian Opie - how to do it

 First, open PhotoShop

 Then go to Layer, then New and then Layer to create a new Layer

 Choose brush tool

 Make sure the colour is black

And have the master diameter on 20px and the hardness on 100%

 Change to pen tool

 Go to Paths

 and create a new path

 like so

 start the point where ever you like, in this case, my parting

 click once then go around the parting/hair and click to make an anchor point

 you'll end up with something like this

 it is preferable if it joins up

 right click on Path 1 and go to Stroke Path

 You'll get this menu coming up. Make sure it is on Brush then click OK

 you now have a black outline!

 go to Create a New Path

 and now you have another one

 then go around other details such as the face, shoulders etc.

 By clicking off the background, you will see this. Make sure you check that the picture is okay and there aren't any mistakes.

 some time later

 we have a basic outline. Now for the glasses!

 going around the glasses

 on the other side

 and now the bridge

 time for the eyes!

 The diameter was changed to 40. Just create a black cirlce

 change the colour to white

 then add the highlight

 change to paint bucket tool and fill in the colours

 like so

 and voila!

Note: I couldn't get screenshots because it would only go on Microsoft Word so I had to use a compact camera and take the pictures of the computer screen. I edited the pictures on PhotoShop by changing the Levels and cropping them in.