What still annoys me is that your powers get stronger as you fail to feed. I always felt you should be stronger the more well-fed you are.
I actually feel though that a better feature would have been for you to change as you became more blood-starved and make it over the course of 10 days instead of 4 days with a new stage every second day with 5 stages.
Stage 1 - you look exactly as you were before being turned and your fangs retract outside of combat. Sunlight has no effect. You are also able to use the facechanger at this stage as you are "almost alive" from the fresh blood coursing through your system.
Stage 2 - your skin grows deathly pale and sunlight weakens you (when outside during the day, stamina, health and magicka regenerate at half speed) also regardless of your original eye colour, your eyes now take on an amber/yellow/red colour depending on your race and gender.
Stage 3 - your eyes glow and your fangs no longer retract outside of combat. You gain a certain level of cold resistance and vampires out in the world no longer attack you.
Stage 4 - No real changes physically but health, magicka and stamina do not regenerate at all when outside during the day. Fire now does double damage and while you are on fire regardless of where you are your health will not regenerate until the burning stops, stamina and magicka remain unaffected by the fire.
Stage 5 - you take on the monster/batlike features of the vampires found in castle volkihar and sunlight causes you 2 points of burning damage until reaching 50% health at which point it goes on to do 5 points of damage per second until death or you find shelter or the sun goes down. However, your health and stamina regenerate at 30% faster than normal when sunlight (or fire) are not involved (being indoors or out at night).
Also at stage 5 you should be attacked on sight BUT if you are wearing something that completely covers your face you should be safe from attack as no one can actually see your monstrous features.
Another thing would be that at stage 5, sun damage is doubled if you are naked
