The page of this last issue of Hugo Pratt shows Pratt's sovereign usage of shadows and abstraction, a style that was perfected in the comics to come like Corto Maltese, La macumba du gringo (compare this page with the one of Kyeezee
https://www.2dgalleries.com/art/la-macumba-du-gringo-planche-24-163229 or this one from BillBaroud
https://www.2dgalleries.com/art/la-macumba-du-gringo-planche-25-32900) or Jesuit Joe to name some.
The construction of the whole page is masterful. The first panel with its built-in curve, the connection in the shadow between panel 1 and 2, the extreme play with shadows and movement and abstraction in the panels 4 and 5 and in the whole lower section - everything on this page shows a maturing master of its art.