Step 1: Head
Draw a cube for its head( Duh ).
Step 2: Body
Draw a longer and thinner rectanglish shape for the body.
Step 3: Legs
Add the three legs ( You can't see one ) to the body.
Step 4: Details
Now add the creeper face and those random pixels on its body to your creeper.
Step 5: Ink
This step is optional if you like your creeper how it is then you're done. If you want to ink it I just use two different pens- one for the head, body and legs and one for the pupils and random pixels on the body. ( by the way, all the pics are backwards )