A fine capture of a touching emotion shared between mother and child.
For myself, and it is only my humble opinion, I think your photo as is is perfect. With regards to your exposure - awesome! The over-exposed background seems to surround and embrace the two subjects as if by a halo of softness. Seems it adds a sense to the emotional moment. To darken the background would simply blend the subjects with their background. As it is it sets the subjects and their tender moment off very well. This is simply my opinion and the why of it. Not to start an argument. But, we all see differently. And, you being the artist and photographer it is for you to say what should be. Well done.
And, welcome to the Blog. I sincerely hope that you will bless us with more of your fine perspective of the world that you see. You add to my life. Thank you.