Adorable!! I love the second one. That is so sweet and original. My critique would be that they are a little dark. Especially on #1, maybe dodge the baby's face to brighten it up a bit.
edit to add that I actually like the other version of #2 on your flicker even more than this one. To me it is more engaging to the viewer...the fact that he is playing with the train/baby, plus the opposite faced bodies. I love it!