The conventions of this representation, head tilted, lips slightly parted, large-eyed, curling hair cut in locks grazing the neck, were developed in the 3rd century BCE to depict Alexander the Great.
ðə kənvˈɛnʃənz ʌv ðɪs ɹˌɛpɹᵻzˈɛntˈeɪʃən, hˈɛd tˈɪltᵻd, lˈɪps slˈaɪtli pˈɑːɹɾᵻd, lˈɑːɹdʒˈaɪd, kˈɜːlɪŋ hˈɛɹ kˈʌt ɪn lˈɑːks ɡɹˈeɪzɪŋ ðə nˈɛk, wɜː dɪvˈɛləpt ɪnðə θˈɜːd sˈɛntʃɚɹi bˌiːsˌiːˈiː tə dᵻpˈɪkt ˌælɪɡzˈændɚ ðə ɡɹˈeɪt.