@Ciroman, regarding which method to use I would have to agree with Laa-yosh about organic box-modeling being somewhat obselete. Maybe I’m bias, but I’ve always found box-modeling a head to be a real painful task as opposed to poly-by-poly modeling. and now even more so with the advent of Sculpt/retopo.
Now don’t get me wrong, there are people like Glen Southern who thrive on box-modeling and can read the forms/flow with ease. I’ve always found it to be artistically counter-intuitive however.
Sculpting/Retopo allows me to create without worrying about topology and it’s so much quicker to experiment with forms(even drastically) with worrying about re-directing/re-distributing edgeflow.
And retopo can be created so rapidly with the aid of a topo-sketch paint-over in your sculpting app so the flow can be worked out non-destructively without ever having to cut/redirect whilst in the process. once you have sketched the topology in 3d on the mesh it’s a simple case of tracing at the retopo stage.
So I suppose it certainly is a case of personal preference(everyone’s brain working differently:) but I do feel that box-modeling heads is indeed a dying artform.