Always happy to pull one of your images. As a single image this is great. Great lighting, nice subtle colors and I like how the outfit just kind of blends into the background. On top of that the look is priceless. A very nice image overall.
As for the challenge I am not sure if its the best choice. You met the challenge with the division into three parts, but I am not sure if thats the best choice for this pic. I would prefer to have this image without the borders and just had baby all to him/herself. I am not sure if I could suggest a way that splitting it into three would have served you better.
Again - very nice image. I really have no issues with any of the technical or artistic choices made. Get rid of the borders and print this baby out.
Umm, nice picture, but just spliiting a single image into 3 really doesnt strikeme as classic triptych. amazing image on its own, but thats half the problem. it is on its own.