I like everything except the city walls right up to the beach. Most cities at the time would not construct city walls right to the beach except in certain instances:

Solid ground, bedrock, cliffs, etc Ground too soft would cause the towers and walks to sink and buckle under their weight in the waterlogged earth.

Now, that could poss an interesting backdrop for the city, a decrepit places, the curtain walls sagging under their own weight, etc, etc...