Dear Claude,
It is very nice engraving as always. I do notice some issues which I will mention in case they are relevant to Dorico:
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Some of the dynamic signs are too far from the notes in the Soprano part: m. 23, for example, and m. 36-38 Cl. and Tpt., or misplaced as the fff in m. 44 Vc., f in m. 52 Perc., all P in m. 16. If an instrumentalist is vocalizing it would be better to handle the dynamics as in a vocal part. And it is not necessary for all dynamics in a certain area of a staff to line up on a single horizontal if this causes dynamics to be too far from the notes.
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The staves are too widely spaced on the first page. It would be better to have more space between the title and the top staff in the interest of visual comprehension.
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The tempo and metronome markings seem too small to me, as do the measure numbers.