Another example of children FAILING to improve their own writing can be seen here:
You can see that the child has tickled pink their causal connective and is happy that they have used it. However, that connective is the word 'BECAUSE'. How boring!
If that child could really improve their own writing, they would know that using 'BECAUSE' is really easy. A good 'reviewer and reflector' would know this and try out some different causal connectives. They would be able to write a green for growth, 'Next time I would' comment and give an example of a sentence that uses their harder connective.
They haven't done this, because they can't. Teachers know best, children know nothing.