Op. 81 is a flowing, impressionistic-leaning piece that deviates from the more mechanical earlier entries. Its distinctiveness lies in its lush harmonic washes and undulating rhythmic figures.
Use sensitive pedaling to connect the flowing lines without muddying the harmonic changes.
Comparable difficulty and character — good candidates for what to learn next.
Bipuntología (Op.81) 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 Bipuntología (Op.81) lasts about 4.2 minutes.
Bipuntología (Op.81) 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 Brisa Dorada by Luis Félix Parodi Ortega, Bipuntología by Luis Félix Parodi Ortega, Bipuntología Op.95 by Luis Félix Parodi Ortega — see the full similar-pieces list on this page.