I like it - the lighting looks soft and flattering, I like the variation in textures of her plaid dress and curly hair. She's got a lovely happy expression also. I always try to get a catch light in the eyes as it brightens/livens them up - the main draw to a portrait is usually the eyes - a lot of expression comes from the eyes. With her looking off camera it's a nice image - looking at camera could be even better ie interacting with the viewer - that's where your skill as a Portrat photogrpher comes into play to get her to interact with you - And as is people all over, different people will like different things - (I did a session the other day with 6 girls and their favourite pic from the whole session was one of one of them looking off camera! Ha! )
One of your best critics will be the Mum - if she'll give you comments honestly and without being guarded. Ask her not to be kind but expect the worst
Try showing her the whole session and pick up on what she likes the best.
I hope that's helpful.
I look forward to seeing more