H.J. Feng's work is a contemporary composition that adopts the title 'Ballade' as a nod to historical forms. It typically features accessible harmonies and a lyrical, song-like structural approach.
Focus on the balance between the melodic line and the harmonic background in the left hand.
Comparable difficulty and character — good candidates for what to learn next.
Ballade No.3 is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5.
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.
Ballade No.3 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 Camellia by H.J. Feng, 'Adeste Fideles' with Variations by W.E. Tipper, Beside Still Waters by Bernard Hamblen — see the full similar-pieces list on this page.