Miniature On Parchment, Evening Stroll In A Park, Signed "aubert," 18th Century

Louis Aubert?—18th-century French school,
Scene of a Stroll in a Park,  Gouache on parchment, 19.5 × 12.5 cm.
This finely painted gouache miniature on parchment depicts a lively scene in a garden as night falls, near an Orangery, combining architecture, landscape perspective, and groups of strollers.
The parchment has a translucent quality, creating a stained-glass effect, see photo;
This subject is rare and very carefully composed, signed “Aubert” in the lower right corner.
On reverse, the parchment features graphite outlines intended to reinforce, through translucency, certain contours, details, and color contrasts.
This technical feature could indicate a preliminary study for a larger composition.
The subject and decorative nature of work appear consistent with the known work of Louis Aubert, a musician and painter of landscapes and genre scenes, to whom  the Bénézit attributes, among other things, princely paintings for Fontainebleau, Versailles, and Compiègne. (photo).
In fine condition, sheet shows little wear, unframed;
on reverse, ahand written inscription in German describes this stroll through a French garden, including its dimensions and the notation “parchment,” 1770–1775, and signed Aubert.
I found one unsigned painting for which this miniature might serve as a model in an Osenat auction; see photo…
Who will continue the investigation? Not me—I’m not qualified.
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SIRET: FR 24 430113233.
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