This piece is a short, evocative work Debussy wrote for a theatrical production. It showcases his signature harmonic language and delicate approach to the cradle-song genre.
The primary challenge is balancing the delicate inner voicing against the oscillating accompaniment.
Comparable difficulty and character — good candidates for what to learn next.
Berceuse pour 'La tragédie de la mort' 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 Berceuse pour 'La tragédie de la mort' lasts about 4 minutes.
Berceuse pour 'La tragédie de la mort' 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 Berceuse pour 'La tragédie de la mort', CD 100 by Claude Debussy, Clair de lune by Claude Debussy, La cathédrale engloutie by Claude Debussy — see the full similar-pieces list on this page.