The majority of scholars view that wiping the ears in Wudu is Sunnah and recommended, but is not obligatory. If a person forgets to wipe his ears, he is fine and his Wudu is valid.

A woman may wipe her head in Wudu by wiping the entire head from the crown of the head all the way to the back of the head or by wiping the hair with both hands from front to back and not to bring the hands back again.

If you wash your right foot then dry it, then you wash your left foot without taking as much time as it would ordinarily take for it to dry by itself, then your Wudu is valid.