I don't just draw these out, I start with a picture or image I think best represents the subject. I tool around with it until I am satisfied and then transfer that to the canvas (I use an old technique I learned a long time ago without much help, just a pencil and ruler).
I transfer the images to the canvas as pencil, then I go back and draw the lines with a Sharpie pen. I erase all pencil lines, since the lead will get mixed with the medium and get all greyish and dirty.
If I feel like it, I will fill in some of the shading so that its easier to distinguish what wrapper goes where, like my next subject, James Brown.
You can see the next two subjects I will be doing below: Can you guess who they are?