Here is the beginning of a drawing, eraser dust and all.
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Around the head on the right, which is barely penciled in, you can see that I made a grid to help me with the shape.

Now it looks like this.
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I’m using a much more sketchy technique than usual to give it more character.

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Above you can see how I draw it right off my computer.

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Something to be careful of is smudging with your hand. You can see that there is a lot of difference between the erased part and the smudged part. To prevent this, just put a piece of paper underneath where your hand is resting.

Below is the picture I’m drawing from.
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Sorry, some of the pictures aren’t that great, I just took them real quick.