This is a charming salon-style waltz by the popular German dance composer Oscar Fetrás. It is characterized by its lighthearted melodic invention and typical late 19th-century ballroom rhythmic structure.
Focus on maintaining a steady, buoyant waltz rhythm without rushing the melodic phrasing.
Comparable difficulty and character — good candidates for what to learn next.
Blaue Augen-blauer Himmel (Op.75) is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 3.
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 Blaue Augen-blauer Himmel (Op.75) lasts about 4 minutes.
Blaue Augen-blauer Himmel (Op.75) 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 Blumenreigen by Oscar Fetrás, Boccaccio-Walzer by Oscar Fetrás, The Entertainer by Scott Joplin — see the full similar-pieces list on this page.