Neices Part 2, CC Appreciated

I am sure you can tell from these pictures that I don't know much about portrait photography. I haven't done any before so I am just going by instinct. I haven't done any PS post-processing yet (besides cropping) and I have RAW images of all the pictures.

My Neices asked if I could do a portrait of them as a christmas gift for their parents. They would like to get it enlarged and framed as a christmas gift.

Which picture do you like best?

I would appreciate any CC.

Pictures 3 & 4:
Camera: Canon Digital Rebel
Shutter speed: 1/100 sec
Aperture: 3.5
Flash: Off
ISO: 200
Lens: 70-200mm 2.8L
Focal length: 200mm
AF mode: One-shot AF

HOSTED PHOTO
please log in to view hosted photos in full size.

HOSTED PHOTO
please log in to view hosted photos in full size.

It might be my eyes, but they look a bit soft.

yes, I was looking for a softer picture here..........

I really like the first one! Beautiful smiles

I shot these at 200M so I would get a softer feel.

Everyone, what would you do post processing wise to improve the pictures?