It depends what you want with your model, the drawing you are following is pretty rudimentary, if you want it to look like that you can, you just need to draw in the edges as shown and stitch the faces together. Faces are basically made from triangle, so you would need to draw in all the edges that would form the angles and curves.
There are several plugins and methods that can help.
For example here is Curviloft.
And go Here for a couple of manual ways.
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