For perfect bathroom lighting...

To maximise natural daylight, take down blinds, fussy curtains and unnecessary window dressing . If you're worried about being overlooked, a cheap solution is to frost your window - either pay a glazier or use a frosting-effect spray from DIY stores.
If you have only a harsh central light operated by a pull cord, one of the easiest ways to create instant ambience is to ask an electrician to fit a dimmer switch just outside the bathroom door instead.
Replace existing fittings with frosted ones - you'll immediately get a lovely diffused light.
Stud the ceiling with several low-voltage spotlights or downlighters, which wash the walls with light. Downlighters cast pools of light onto the surface below and are great for water and glass. Get your builder to put in a false ceiling to hide the wiring.
Fit downlighers with a dimmer. You don't want to be blinded by the light when you go to the loo in the night.
To light your mirror, install a row of lightbulbs, dressing-room style, around it. They give a good, even light from all sides. If that look's not your style, fit diffused wall lights on each side. Either way, avoid a single strip above the mirror or you'll end up with shadows below your nose and above your mouth. If the light's too soft, it will flatter your skin but you won't be able to see well enough to get your make-up right. If it's too bright, it will give you a ghostly pallor.
Put all the lights on different switches so you can alter the mood - for shaving you could use the lights round the mirror and a wall light but, when you're in the bath, just the wall light dimmed right down and a few candles.
If you have a period bathroom you can fit shades to wall-mounted fittings, but they must be approved for bathroom use.