She let her flying raiment sweep,
enmeshed with woven spells of sleep,
as round the dark void she ranged and reeled.
From wall to wall she turned and wheeled
in dance such as never Elf nor fay
before devised, nor since that day;
than swallow swifter, than flittermouse
in dying light round darkened house
more silken-soft, more strange and fair
than sylphine maidens of the Air
whose wings in Varda's heavenly hall
in rhythmic movement beat and fall.
--The Lay of Leithian, J.R.R. Tolkien
Brushes from [link]
Textures from [link]
References for Lúthien's pose from [link]