I'll use bits of graphic detail to highlight dramatic events in combat, such as an important death - and sometimes to convey how badly damaged a foe or ally appears to be. That's it.
I want a fast, highly focussed pace for combat (as far as possible with spellcasters in the group, who always need more time to think), and I find overdescribing detracts from that.
I don't change DnD combat game mechanics - no called shots, no crippling of combatants by broken bones, severed limbs etc. Again I find it detracts from the fast-paced combat I want for DnD.
If someone goes below -40 hp I'd not allow raise dead, same thing if the enemy has taken the effort of further mutilating the body after the death.
At a mere -20hp or so I wouldn't have a problem allowing a raise dead though, if I'm DMing in a core rules setting where the spell is available.