Stanza 1 last line: although "ramiers" could mean "branches and boughs chopped from trees before they are neatly lined up" I don't think that it means that here, and even if it did I don't see how that could be called "forest". So it's probably better to stick to "doves" or "pigeons" (columba palumbus), which is the most common meaning (in South West France, columba palumbus is mostly called "colombe" rather than "ramier"; in the rest of France and in Belgium it's called "ramier").
Stanza 3 line 2: "encore" qualifies "crois" not "voir" so the line means "I still think I see her" rather than "I think I still see her".
Stanza 3 line 3: those "tall sails" and "long veils" or "long robes". "Entrouvrir" means "ouvrir en fendant" - something like "drawing apart".