#1 #5 seem to have a very bright splotch at the subject's left side neck, which is pretty distracting.
#2 is rather smudgy and indistinct.
#s 3 and 4 have excellent potential as commercial illustrative techniques. I've seen techniques such as this in magazines teaching Adobe Illustrator techniques and magazines showing off various illustrator's work.
I like jas00n_86's idea about painting back in some color, possibly using #3?