Hekel Tavares, a prominent Brazilian composer, infuses this nocturne with lush, late-Romantic harmonies and rhythmic inflection. It is notable for its expansive, sweeping melodic gestures typical of the era.
Broadening the hand to encompass wide-span chords while maintaining a singing top line is the primary technical test.
Comparable difficulty and character — good candidates for what to learn next.
...E nada mais! is rated Henle level 6 of 9 — advanced repertoire, roughly ABRSM grades 7–8.
You should be comfortable at Henle level 6 — meaning you can already play level 5–6 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
A typical performance of ...E nada mais! lasts about 4 minutes.
...E nada mais! is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.
Pieces at a comparable difficulty and character include Liebestraum No. 3 in A-flat major by Franz Liszt, 'Ch'io mi scordi di te?' by Wolfgang Amadeus Mozart, Asturias (Leyenda) by Isaac Albéniz — see the full similar-pieces list on this page.