Cardosina is a charming tango by the Brazilian master Ernesto Nazareth. It is distinctive for its fusion of European dance rhythms with the syncopated 'maxixe' style native to Brazil.
The primary challenge is maintaining a consistent, relaxed syncopated rhythm in the left hand against the melodic phrasing.
Comparable difficulty and character — good candidates for what to learn next.
Cardosina is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 6.
You should be comfortable at Henle level 4 — meaning you can already play level 3–4 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 Cardosina lasts about 3.5 minutes.
Cardosina 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 Beija-flor by Ernesto Nazareth, Beija-flor, IEN 4 by Ernesto Nazareth, Arreliado by Ernesto Nazareth — see the full similar-pieces list on this page.