Tinel's writing for keyboard here explores harmonic colors that transition between traditional tonality and late-century chromaticism. The piece is distinguished by its dense textures and deliberate pacing.
At Henle 4 this is an intermediate piece that expects secure technique and real attention to phrasing. The main demands: chord voicing — bringing out one note inside a handful of others; a left hand with real melodic or rhythmic responsibility of its own; and a true singing tone, with the melody floating above the accompaniment.
Careful attention must be paid to balancing the voices, particularly when the melody moves into inner registers.
Comparable difficulty and character — good candidates for what to learn next.
A level or two down with the same spirit — ideal if this piece is still out of reach.
Where this piece's skills lead: slightly harder works making similar technical demands.
Lesser-known works by the same hand, at a comparable level.
De kerels (voor klavier) is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 5.
You should be comfortable at Henle level 4 — meaning you can already play level 3–4 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 De kerels (voor klavier) lasts about 3 minutes.
De kerels (voor klavier) 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 Ballade No.1 for Piano by Jef Tinel, Ballade No.2 for Piano by Jef Tinel, Ballade (voor piano) by Jef Tinel — see the full similar-pieces list on this page.