but I must comment that the writing leaves much to think about especially how terrible it can be to lose a child.

Does it mean that it doesn't do enough to convey how terrible it can be, or that it does? (I don't know the expression "leaves much to think" in English)

The exercise was to see if I could convey it even though I haven't lived it, but I'm not confident about my ability to express these emotions that I haven't felt.