Kevin
Here is what I do. I'm no expert, but it will allow you to experiement.
I glue my paper patterns onto luan (or some other cheap, durable surface) and cut them out so I can easily trace them onto wood or in the case of modifying a pattern, paper. Get yourself some newsprint sheets. I like them because they are big and cheap. First trace your body pattern (multiple times), keep in mind that this will need to be nodified a little as you finalize your head position, most of the modification will need to be in the breast area. Now take your head pattern, keeping in mind that the basic shape you will use from this is fron just behind the top of the head to where the neck and head meet, forward. Dont worry about the rest of the neck, or if it helps, cut out an extra piece and cut off this area you dont need.
Now, looking at lots of photos, work on placing the head where it "looks like it should be" then freehand drawing in the neck. Make multipe tracings of the body, trying differing head positions and different ways of completing the neck untill you get "the look" you want.
Other more experienced carvers I'm sure have more scientific ways of going about it, but that is how I do it on my gunners.
Best of luck
Chuck