Luigi Falcon's version shares the title with Leopoldo's, serving as a standard entry in the repertoire of romantic Italian character pieces. It is defined by its expressive melodic curve and modest emotional weight.
Focus on the legato connection of the melody across leaps.
Comparable difficulty and character — good candidates for what to learn next.
'O ritratto d''o core is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 4.
You should be comfortable at Henle level 3 — meaning you can already play level 2–3 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 'O ritratto d''o core lasts about 3 minutes.
'O ritratto d''o core 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 Waltz in A minor by Frédéric Chopin, Prelude in E minor, No. 4 by Frédéric Chopin, Butterfly Lovers by Shuwen Zhang — see the full similar-pieces list on this page.