Oesten's "6 Bluettes" are charming, light character pieces for the piano, often featuring elegant melodies and simple accompaniments. They are designed to be pleasant miniatures, showcasing graceful lyricism.
Focus on maintaining a clear, singing melody while executing delicate sixteenth-note passages.
6 Bluettes (Op.118) is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 3.
You should be comfortable at Henle level 4 — meaning you can already play level 3–4 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 6 Bluettes (Op.118) lasts about 3 minutes.
6 Bluettes (Op.118) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.