So I'm reading "Manuscript Makeover" and there's advice early on to add 'voice' to one's writing and the idea of 'voice' is conflated with 'characterization' ... and the examples provided of 'good voice' could be seen as melodramatic. Depends on externals.
Harlequin - I think you nailed it with 'what the run up' is. If there's no reason to think character A and B have a strong relationship, then any extended gnashing of teeth by B when A dies ... is a bit ... off.
But, emotional depth is what we strive for. Not in the sense of 'the grief was like a claw to his heart, scraping him clean, a single drop of blood sprouting forth like the death of the evening sun...' ... lol ... but more like, you know, when ... your mom dies, and you feel it in the day to day. You feel it in your heart, like an ache that can't be ignored for more than an hour or two. And it's inconvenient, maybe, because you don't have a car and she would take you places and you feel like a heel for missing *that.*. And your baby will never know their grandmother. That sucks. And you see your mom's eyes in your baby.
It's not a single drop of blood from a claw to the heart. It's that ... this baby that you are raising will always wear your mother's face. And you love that, and it brings you to tears at the same time.
That's what I think.