Pyotr Ilyich Tchaikovsky's Op. 51 '6 Pieces' are delightful, often lesser-known, miniatures that reveal his gift for melody and atmospheric writing. They offer a range of moods from playful to deeply expressive, characteristic of his charming salon pieces.
Focus on subtle color changes and nuanced pedaling to enhance the evocative atmosphere.
6 Pieces (Op.51) is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 6.
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.
6 Pieces (Op.51) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.