Step 1 - Start with a pencil and draw an oval shape for the head and Ben's body below, notice that the body is twice the length of his head.
Step 2 - Draw two rectangles for his legs and add a small line between them, notice that the length of his legs is the same as his body and head together.
Step 3 - Sketch Ben 10's shoes, draw the outer shape of the shoes and add two more curved lines inside.
Step 4 - We're going to draw his arm, start with a rectangle shape of his sleeve, add an oval shape next to it and another one facing up.
Step 5 - For Ben 10's hand we are going to divide it to three parts as well, start with the main shape of his hand and connect two more for his fingers and thumb.
Step 6 - Do the same for his other arm and hand, start with the part closer to his shoulder, notice that the hand ends just under the left sleeve.
Step 7 - Draw Ben 10's neck and hair, start drawing the outer shape of his hair and add a zigzag line inside. Draw his ears just below the middle part of his face.
Step 8 - Sketch his eyes, eyebrows, nose and mouth, notice that his eyes are at the middle of his face just above the ears line. Add two curved lines for the pockets on Ben 10's pants.
Step 9 - Trace you drawing with a black marker or pen while adding more details to his hands, you can follow the way I was drawing his fingers by clicking on "Step 9 in th video above.
Step 10 - Color your drawing, couple of things to add:1) The figure 10 on Ben 10's shirt just behind his watch.2) Two circles painted as green inside his eyes.