This piece by Carlos T. de Carvalho reflects the Brazilian salon style that integrates European romantic tropes with local sentimental character. It relies on a flowing, vocal-like melodic line typical of the genre.
Pay close attention to the stylistic rhythmic nuances in the left-hand accompanying figures.
Comparable difficulty and character — good candidates for what to learn next.
Bonita como eu só... 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 Bonita como eu só... lasts about 3 minutes.
Bonita como eu só... 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 21 de abril by Carlos T. de Carvalho, Amar... só a ti by Carlos T. de Carvalho, 1914 by Carlos T. de Carvalho — see the full similar-pieces list on this page.