Starting with a sphere, I got rid of redundant polygons and extruded edges to form the shape of the back of the head. This was really quite easy, it sounded and looked quite a daunting task, but once I got stuck in it didn't actually take that long to get some results.
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Using Alt+X I was able to see clearly through the transparent mesh to gain accuracy.
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After forming the majority of the head neck and shoulders, I attached the "sphere" to the face I had already created but none of the vertices were joined up. So individually welding the vertices together I managed to get one entity, shown below with and without both the grid and turbosmooth modifier.
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It obviously needs tweaking once again, but that's not bad! I really feel like I've achieved something today because it just looks like its starting to come together!