I have spent about an hour sifting through all the wonderful images and I kept coming back to this thread by Alex and his kids. Some may say I have a bias towards family/child portraiture, that may be,or maybe I just am looking forward to the day I have my own kid/s to take a zillion photos of. I think the 3rd image in this series is delightful. The eye contact, the light (and catchlight) as well as the B&W conversion all work for me.
If I were being super critical, in a perfect world I would love to have seen the little one's right arm/hand in full..but working with kids you sometimes just have to get what you shoot, or shoot what you get? Here's the original image:

Congratulations Alex! Well done.