Arthur Mason's Berceuse is an accessible, pedagogical-style work that adheres to traditional tonal structures. Its primary distinction is its simplicity and clear, song-like phrasing.
Practice achieving a soft, bell-like tone quality throughout the melodic passage.
Comparable difficulty and character — good candidates for what to learn next.
Berceuse (Op.144) is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 3.
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 Berceuse (Op.144) lasts about 2 minutes.
Berceuse (Op.144) 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 fille aux cheveux de lin by Claude Debussy, Solace by Scott Joplin, Au Matin by Benjamin Godard — see the full similar-pieces list on this page.