For headshots, I find I almost have to fight back the "creativeness" to make sure the model really shines through. Some of the highlights you have, while might look good, doesn't really do the model service.
3 works best in that regard, but I think it could use some touching up still.
I agree with RMThompson. Sometimes you have to tone down the creative vibe on a headshot, especially with a paid client. It looks like you may have pushed the contrast a little hard (especially in the second and last shots). While making your photos spark, it also brings out the subject's blemishes and flaws. Sometimes even bringing stuff out they don't notice about themselves. Other than that, good job!