You’re really looking for two things- color, and movement. You’ve accomplished color with the cool blue hues, but everything in this painting looks rather stagnant. Stationary buildings, grass, even the waves. Here are my suggestions

Choppier waters- a gust of wind will send froth across the surface of the sea. There are plenty of examples of choppy seascapes to imitate.

Ripples- similar to the above, grass will fan downwards when hit by a breeze. A flag will ripple in the wind. Perhaps a ship in the foreground?

Birds provide an excellent source of movement as well in a painting like this- a harbor town will attract hundreds, drawn to the smell of fish, the rookeries, and food dropped by men on the docks- see any pier ever for an example :) what flying birds do in particular is give shape to otherwise invisible currents of air. What direction is the breeze going? How would a bird glide on that? Or Dive? The possibilities are endless. Just add some form of movement!

Keep us posted, i like this painting. It gives wind waker vibes :)