Halldór Jónsson's 'Björtum faldi bárur skarta' is a modern Icelandic piece, possibly a transcription of a song. Its musical distinctiveness would come from its lyrical melody and nuanced harmonic language, designed to evoke a tender or evocative mood.
Pay close attention to shaping the melodic line with sensitivity and a gentle touch.
Björtum faldi bárur skarta is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7.
You should be comfortable at Henle level 5 — meaning you can already play level 4–5 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
Björtum faldi bárur skarta is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.