It's not as if it starts with a fixed amount of energy and gradually loses it - - - the hot water in the ocean combined with the favorable atmospheric conditions allows it to keep growing and building - - - if the conditions change (cooler water, shearing winds, etc.) it will weaken, but if they don't then it can sustain itself . . .
The eye is very defined. It's frightening but she is beautiful. Looking at a 1969 sat photo of Camille, it's almost deja vu.