Richard Strauss's Albumblatt is a sophisticated, brief piece reflecting the composer's early harmonic sensibilities. It is distinguished by its dense, Brahmsian textures and expansive, vocal-like melodic writing.
The player must manage the dense voicing and thick chords to prevent the texture from sounding heavy.
Comparable difficulty and character — good candidates for what to learn next.
Albumblatt is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 8.
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 lasts about 4 minutes.
Albumblatt 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 Liebestraum No. 3 in A-flat major by Franz Liszt, 16 Waltzes by Johannes Brahms, Ballade by Amy Marcy Beach — see the full similar-pieces list on this page.