Anton Deprosse’s album leaves are characteristic of the 'Albumblatt' genre, designed to be intimate musical sketches. They rely on sentimental harmonies and song-like melodies that were popular in German-speaking domestic settings.
Develop a singing tone (cantabile) to bring out the lyrical quality of the primary melodic lines.
Comparable difficulty and character — good candidates for what to learn next.
2 Album-Blaetter is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 4.
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.
A typical performance of 2 Album-Blaetter lasts about 3 minutes.
2 Album-Blaetter 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 Ave Maria in A (1860) by Camille Saint-Saëns, Bohemian Melody by William Vincent Wallace, Berceuse by Laura Netzel — see the full similar-pieces list on this page.