the accurate translation:
14 His head and His hair were white like white wool, [as white] as snow, and His eyes [flashed] like a flame of fire.
15 His feet glowed like burnished (bright) bronze as it is refined in a furnace, and His voice was like the sound of many waters.
18... 'These are the words of the Son of God, Who has eyes that flash like a flame of fire, and Whose feet glow like
bright and
burnished and
white-hot bronze:'
burnished - made smooth and bright by or as if by rubbing; reflecting a sheen or glow;
burnished - to improve or make more impressive
so, the biblical description of His 'bronze' feet looks something like this:

there is no biblical description of His appearance before the cross.
extrabiblical material reads as such:
'Letter of Lentulus
The Letter of Lentulus (/ˈlɛntjələs/) is an epistle of mysterious origin that was first widely published in Italy in the fifteenth century. It purports to be written by a Roman official, contemporary of Jesus, and gives a physical and personal description of Jesus. The letter may have influenced how Jesus was later physically depicted in art.
It appears in several Florentine publications from around 1460 along with works of such humanists as Petrarch and Boccaccio.[1] The letter was first printed in Germany in the "Life of Christ" by Ludolph the Carthusian (Cologne, 1474),[2] and in the "Introduction to the works of St. Anselm" (Nuremberg, 1491).[3] But it is neither the work of St. Anselm nor of Ludolph. According to the manuscript of Jena, a certain Giacomo of the Colonna family found the letter in 1421 in an ancient Roman document sent to Rome from Constantinople. It must have been of Greek origin, and translated into Latin during the thirteenth or fourteenth century, though it received its present form at the hands of a humanist of the fifteenth or sixteenth century.[4] Christopher Mylius, the 18th-century librarian of Jena, stated the letter was written in golden letters on red paper and richly bound, but lost.[5] In 1899, Ernst von Dobschütz listed over 75 historical manuscripts from Germany, France, and Italy that include the Letter of Lentulus in variant forms.
The purported letter reads, in translation:
Lentulus, the Governor of the Jerusalemites to the Roman Senate and People, greetings. There has appeared in our times, and there still lives, a man of great power (virtue), called Jesus Christ. The people call him prophet of truth; his disciples, son of God. He raises the dead, and heals infirmities. He is a man of medium size (statura procerus, mediocris et spectabilis); he has a venerable aspect, and his beholders can both fear and love him. His hair is of the colour of the ripe hazel-nut, straight down to the ears, but below the ears wavy and curled, with a bluish and bright reflection, flowing over his shoulders. It is parted in two on the top of the head, after the pattern of the Nazarenes. His brow is smooth and very cheerful with a face without wrinkle or spot, embellished by a slightly reddish complexion. His nose and mouth are faultless. His beard is abundant, of the colour of his hair, not long, but divided at the chin. His aspect is simple and mature, his eyes are blue-gray and bright. He is terrible in his reprimands, sweet and amiable in his admonitions, cheerful without loss of gravity. He was never known to laugh, but often to weep. His stature is straight, his hands and arms beautiful to behold. His conversation is grave, infrequent, and modest. He is the most beautiful among the children of men.'