My suggestion is simple, show a health bar indicator in some form whether it's a bar, a circle, an aura or whatever which is actually situated
on your character rather than docked in the corner of the screen.
The point of it is that when you're in the middle of a heated battle you often don't have time to look at the health bar at the top of the screen, or simply don't realise how much damage you're taking and forget to check your health, and then you hear the low life warning sound and frantically reach for the potion button and suddenly *BAM!!* you're dead before you get a chance to drink the potion.
That might sound silly to some, but when you play the game at 1280x1024 resolution the health bar is a fair distance from the centre of the action, and so it's not always easy to keep an eye on it when you're surrounded by twenty murderous skellies all wanting a piece of your skull.
I've taken the liberty of drawing up a bit of an example in the form of a circle indicator which sits under your character and shows your current health status. A bit like this:
This is something that could be toggled on or off by the player, and also the transparency could be modified to suit their preference.