This item has been on my radar for a while and I keep hoping that a better-resolution image will appear on the internet. So perhaps someone out there has a good scan of this because I have seen this ad many times on the secondary market.
There is a long tradition of using the images of children to sell things and when the children are naked, it helps emphasize something specifically. In this case, the idea is that the watch will last a long time and this sweet little girl will still be using this reliable device even when she is grown up.
 A couple of readers have located a slightly-better version of the image which I have replaced above. Thank you, -Ron