Feanor threatens Fingolfin

"But Fëanor followed him, and at the door of the king's house he stayed him; and the point of his bright sword he set against Fingolfin's breast 'See, half-brother!' he said. 'This is sharper than thy tongue. Try but once more to usurp my place and the love of my father, and maybe it will rid the Noldor of one who seeks to be the master of thralls.'
These words were heard by many, for the house of Finwë was in the great square beneath the Mindon; but again Fingolfin made no answer, and passing through the throng in silence he went to seek Finarfin his brother." ( "The Silmarillion").

I know now that I cannot draw "ideas" or "impressions", or decorative compositions inspired by some verse, like many others do. Only concrete scenes,very colorful and illustrating some quotation...