let's say for the head... you can apply a cylinderal mapping on the front, sides and back of the head...leaving the top head and below the chin polygons.... then u can apply a planer mapping on the top of the head... and a planer on the bottom part... and in uv texture editor...you can move the UVs closer...and sew them i had found this excellent tutorial on the net on unwrapping...lemme see if i could post the link and i m sure it will help ya out...