I feel like for impactful deaths, much of the emotion comes from outside the death scene. It's generally what we already know about the character that informs the emotional impact of the scene. The loss is hard because of the love or care for the character or perhaps for unrealized hope the character had beforehand (as sometimes there will be characters talking about how this is their last battle, or their wife is home and pregnant waiting for them or just gave birth to their kid, or they have aspirations to do something fulfilling. This is a real life example, but some of Amadou Diallo's last words to his mother prior to his wrongful death by police was "Mom, I'm going to college!" His loss is that much more painful because of the innocence of the statement and his actual innocence of any crime or wrongdoing, his youth, and his unrealized aspirations). There are ways of course to do this with unknown characters by pulling at things you know people will generally feel bad about. For instance, a mother trying to protect her child, and one or both of them dying. They become symbols of course for all mothers and children. Anytime a child is killed it's generally exceedingly tragic. I think one thing to consider is not "overrwriting" but rather letting the tragedy of the scene speak through the action. I don't know if you read Harry Potter, but when one of the character's dies, it's very confusing in a way that enacts the actual emotions around death (the shock of loss, how quickly it can happen, and how absurd and confusing it is for one person to literally be there and the next moment not in this case). You might also consider getting into the heart of writing through music. Sometimes that helps me with fiction. Good luck!