Jan Skrzydlewski's contemporary ballade utilizes denser harmonic textures and more demanding technical demands than standard student-level pieces. It focuses on large-scale gesture and narrative tension.
Attention to the voicing of the large chordal textures is required to keep the melodic line audible.
Comparable difficulty and character — good candidates for what to learn next.
Ballade No.3 is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7.
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.
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 Berceuse by Jan Skrzydlewski, Ballade No.1 by Jan Skrzydlewski, Ballade No.2 by Jan Skrzydlewski — see the full similar-pieces list on this page.