I agree with your statement expressed in the title. The portrait could have been stronger with a little more of the girls face and a glimpse of her eyes.
I'm going to have my first daughter in 2 months, so in a few years I can see myself trying to capture a shot like this. But, this photograph belongs in this challenge like a beautifully composed poem belongs in a corporation's annual report. There are photo competitions on the internet that allow for submitting your best photo (or a photo of your choice), however, I believe this site is prompting you to take shots that you wouldn't have otherwise by followin the description of the challenge. I hope this comment is constructive. If your photo finishes lower than you had hoped this might be the reason. Good luck.
adorable child! her dress, from what is visible looks like it could be a 50's era style, which if we could see more of would be even more interesting in this challenge
doesnt comply with the challenge topic. an uninteresting photo of a child. while you may have a strong relation to the subject, the viewers simply do not feel the same.