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Welcome to FM and Photo Critique. I hope you find the folks hanging out here helpful and likewise I am sure you have thoughts that we can learn from.
Image - I think you did a great job for a spontaneous shot. I tend to shoot first and think about it later, especially with the grandkids - their grandmother is my harshest critic.
That said, and I would probably have not noticed either, but the fence post is distracting and a candidate for removal in post. Otherwise, I love the light, exposure, and you certainly have conveyed their enjoyment of the moment...something they will appreciate time and again as they re-visit the image.
Look forward to your sharing more images and your thoughts with us,