Congrats on another commission piece. I like the cities, they're really great.
I think the routes could be better, they are a bit too prominent and almost drown out the map a tiny bit. Also I'm not really fond of the swirly things instead of dots or squares, but perhaps it's just a matter of opinion.
Maybe the mountains could use darker linework because zoomed out they just look like a blob of grey.
I'm glad the client is satisfied, that's the most important park.