@lpetiti You're made great progress. Some things I want to flag. The character still looks Indistinguishable from an adult. As an example of what you can do, in the following image I shifted the eyes to be lower, giving a more juvenile proportion.
Untitled-1.png
This might go against what I said about being faithful to the reference model... The eyeglass frame could be more complimentary to the character. Look up frames for round faces.
The lower legs I think you were going for plump, but instead look swollen. I would straighten the outer sides of the legs so that the skin looks lean against the bone. Shoes/feet could less dome-shaped, more snout-like.
Untitled-2a.png
Lastly, the character could benefit from having a more contemporary attire. She doesn't have to look like a child model for the GAP, but less like an aid worker.
I think I now know what the attire is based on and will keep quiet now 🙊