This is one of the most famous pieces of the Impressionist repertoire, characterized by its fluid, water-like textures and ethereal harmonies. It is distinct for its use of atmospheric color rather than traditional thematic development.
The main technical challenge is achieving a seamless, shimmering tone through sophisticated pedaling and careful balance of melodic voicing.
Comparable difficulty and character — good candidates for what to learn next.
Clair de lune is rated Henle level 6 of 9 — advanced repertoire, roughly ABRSM grades 7–8. In the RCM system it corresponds to about level 9.
You should be comfortable at Henle level 6 — meaning you can already play level 5–6 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 Clair de lune lasts about 5 minutes.
Clair de lune 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 La cathédrale engloutie by Claude Debussy, Berceuse héroïque by Claude Debussy, Canope by Claude Debussy — see the full similar-pieces list on this page.