I like version 3 the best. There is a richness to the paint stokes.
But you could probably get version 1 to look this rich with some more stroking, regardless of it being Photoshop. Take a look at this portrait done in Photoshop 5.5 using the older brush technology.
http://www.geocities.com/bearsclover...2-mid-flat.jpg
Of course, the woman who did this knows color pencil technique, which translates over to using limited software brushes. But still, it is pretty impressive use of Photoshop.