Softness:
* As soft as a baby's breath.
* As delicate as a butterfly's wing.
* As gentle as a summer breeze.
* As smooth as velvet.
Care:
* As caring as a mother to her child.
* As protective as a lion guarding its pride.
* As nurturing as a gardener tending their plants.
Emotion:
* As warm as a hug on a cold day.
* As sweet as a melody.
* As soothing as a lullaby.
Other:
* As fragile as a flower.
* As precious as a pearl.
* As precious as a piece of gold.
The best simile for you will depend on the specific context and the emotion you want to convey.