BV 272a is a subtle, atmospheric expansion of Busoni's earlier musical ideas. It utilizes chromatic shifts that characterize his unique modernistic approach to traditional forms.
The challenge is achieving a seamless legato in a complex harmonic environment.
Comparable difficulty and character — good candidates for what to learn next.
Albumblatt, BV 272a is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 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.
A typical performance of Albumblatt, BV 272a lasts about 2 minutes.
Albumblatt, BV 272a 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 élégiaque, BV 252a by Ferruccio Busoni, Berceuse for Piano, BV 252 by Ferruccio Busoni, Albumblatt, BV 272 by Ferruccio Busoni — see the full similar-pieces list on this page.