This impressionistic work evokes a moonlit seascape through delicate, shifting tonal layers. It stands out for its expansive use of the piano's resonance to depict environmental stillness.
Mastering the control of sympathetic resonance and soft pedal usage is essential for the atmospheric effect.
Comparable difficulty and character — good candidates for what to learn next.
...sobre el mar nocturno se levanta la luna... is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 8.
You should be comfortable at Henle level 5 — meaning you can already play level 4–5 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 ...sobre el mar nocturno se levanta la luna... lasts about 5 minutes.
...sobre el mar nocturno se levanta la luna... 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 Bosquejos del Quinto Sol by Salvador Torre, ... de pronto by Salvador Torre, Gymnopédie No. 1 by Erik Satie — see the full similar-pieces list on this page.