The apperance of an anemone is going to depend on many things:
water quality
temperature
salinity
time of day or photo period
amount of zooxanthellae
lighting
amount of oxygen in the water
pH, calcium, alkalinity
if it is moving or not
if it is fully acclimated with regards to water, light and temp
perpahs even if it is hungry or not.
With proper lighting the anemone will get norishment from the zooxanthellae that lives within it, although some amount of feeding does help. The lighting is the biggest issue.
Much of how it will look is based IMO, IME on the type and health of the xooxanthellae.
Thomas