Everything looks interesting, but it's all very sharp and "edgy" if you will haha. Since there are for HUDs and I would assume they're replacing status bars for health, thirst and hunger? From experience, sometimes having a bar/meter/etc is a lot easier to read than a sphere or object. For my game I'm going to allow the character to show their hunger, rather than have a meter/bar/object. Same with thirst. They will use a phase each 25% of the max hunger/thirst then eventually a small icon (32x32) would appear above their had letting the player know they are hungry or thirsty.
As for the third sprite, I don't really know what it's suppose to mean, but it looks really cool c: