Who is the beautiful goddesses of nature?

Physis, primeval goddess of the origin and ordering of nature.

The Horae (Seasons):

(1) Eunome, Dike and Eirene;

(2) Auxo, Karpo, Thallo;

(3) Pherousa, Euporia, Orthosie

Gaea, Earth mother.

Demeter, goddess of the harvest.

Persephone, goddess of spring growth.

Artemis, goddess of the Wild.

Aura, Titan goddess of the cooling breeze.

Cybele, the great Phrygian Mother of the Gods, a primal nature goddess.

Rhea, the Titan great mother of the gods, queen of the mountain wilds.

Hecate, a Titan goddess, who, from the time of the Titans, ruled in heaven, on the earth, and in the sea, who bestowed on mortals wealth, victory, wisdom, good luck to sailors and hunters, and prosperity to youth and to the flocks of cattle

The many more nature nymphs and other Greek Goddesses and Titans of nature.