I wonder guys, if I insert "random" edges in the face area, will this create any major problem when I smooth the model later?

About this pic; Done some tweaking now. I do this for two reasons. One thing is to "align" the edges so that it matches the sceleton and/or muscles shapes. The other for making a surface that will loose some of its rounded look/shape.

About the head, I can cut it off, but I do not know how I am supposed to attatch it back on if the head and the body has a different level of detail.