Walking by Arrabida Bridge (oil painting)

This is a view near Arrabida Bridge, in Porto, Portugal. Fishermen and casual tourists were hanging near the Douro River in a Saturday afternoon.

This is a very small painting (oil on canvas board, 10x15 cm) and I've used a complementary palette on it (this means that the main colors are complementaries in the color wheel - in this case, blue and orange).
This is a more limited palette than I'm used to, but there's indeed a sense of inner harmony of colors:
'blues' (French Ultramarine, Cobalt Blue and Winsor Blue, red shade), 'oranges' (Cadmium Yellow Hue, Cadmium Orange and Venetian Red), 'neutrals' (Raw Sienna and Payne's Gray) and the usual black & white (Ivory Black and Titanium White).
Somehow I used no black on this painting.

Thanks for reading!

P.S.: I know, the signature is missing :) . I'll have to wait a more dried surface.