Eh... Kinda meh city design. The scale is completely bonkers. Is this meant to be a large city and the portal is just that beeg, or is this just a large trade town with inhabitants in the thousands at most? Really hard to tell from the scale of things and the rather low amount of buildings.
Good things first. The defences are well made, good high walls with towers supporting each other. The moat is made out of a natural body of water, so drying it out will be extremely hard. The city has a river access, that is protected, so fresh water won't be an issue during a siege, plus allows for river trading. Sieging the city already is quite moot, considering the giant teleport in the middle. The city design is simple and organised; accessibility from district to district is easy and getting lost in the streets would take some skill.
The outside of the city has enough farmland to feed it and props to the author for remembering to draw them. So many fantasy illustrators forget that cities need a quite amount of food to stay bustling and most of that food will be produced in the immediate countryside surrounding it.
Now for the bad sides, why eight entrances? There is no reason to have that many. Even if there are multiple roads leading to the city from multiple directions, you could easily have those cross paths and cut the amount of entrances by half, leaving behind a northern, eastern and southern gates and the river access, cutting down the entrance points by half without really affecting the accessibility of the city at all, while at the same time making the defence of the city drastically easier.
Next is the overall design. First, this city can't really expand should the population increase outside of building taller and I doubt they have really invented way to stack multi-storied houses beyond 4-6 floors yet. Reinforced concrete having not been invented yet after all. Second, why the Eight Point Star of Chaos? You want heresy and daemons, this is how you get heresy and daemons. Jokes aside, in a world of swords and sorcery, symbols bear power. So unless the 8 pointed star has some significance to the demons, why risk your city becoming some giant magic circle because of the layout? Unless that is the point and will be revealed later on.
Third, though the moat is quite a blocking tool, and in our world blocking it and drying it would take quite an amount of effort, it can be and has been achieved. In a world of sorcery, it most likely is much easier a task to accomplish. So having no towers protecting the walls is a major weakness. The towers protecting the gatehouses sure are a strong point, but if the invader attacks between them, they aren't covering the walls enough. Should have at least 1 tower between the gatehouses.
And last and quite the least, the forests to the south and west haven't been cut down. They would offer protection to the invader and ease of access to lumber for siege engine production. Should trim them down and turn them to farmlands.
Layout: 7
Defensibility: 8
Details: 8
Own opinion: 8 for Chaos!
Overall score: 8-
Good, but could be better.