Glazunov's Op. 49 Morceaux are substantial Romantic works, often characterized by rich harmonies and sweeping melodies. This set likely demands considerable technical facility and expressive depth, showcasing his mastery of large-scale piano writing.
The main technical obstacle is the execution of the rapid arpeggiated figures with consistent tone and momentum.
3 Morceaux (Op.49) is rated Henle level 7 of 9 — late advanced repertoire, roughly ABRSM grade 8 and above. In the RCM system it corresponds to about level 9.
You should be comfortable at Henle level 7 — meaning you can already play level 6–7 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 3 Morceaux (Op.49) lasts about 6 minutes.
3 Morceaux (Op.49) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.