Not only for a first time project i think its well made. That the areas outside of the town are not just a flat landscape but have a good amount of microterrain features improves the overall impression. But as my list of suggestions is already pretty big, i will not continue to list what i already like about the terrain.

Here are the things i think could be improved.

Overall the town looks pretty similiar wherever you are, so more distinctive looking places would be good. For example have a more modern area with more of the higher houses, where the ground is paved.

Contrast that with one or more poorer areas that are more densley build with huts. That can be mixed up with some small bazaars between them. Might turn in something maze like. At [3891.16,3116.16,0] there is already such a small area pretty much perfect, however very small. I imagine something like that, but on a much bigger scale, just with a bit more space between to walk.

Have other areas that might be still poor, but are improved from huts to some of the poor looking 1-3 story buildings, while still being relative densly build, might have somer bigger roads between them.

Have another area with a bit better looking houses, maybe mixed up with some of the more modern looking commercial houses that are already on the terrain here and there

Make use of where the terrain is located, have one or more bigger bazars. I could imagine a bigger one located between a poor area with huts and one poorer are with real buildings, where the bazaar functions basically as a dividing line.

Have bigger, industrial areas, maybe only one or two, but its often more useful for missions to have a few but bigger industrial areas instead of multiple smaller locations.

You already have a big river and a big town, why not have one or two harbors, one more commercially/industrial, one further away for civilian use. The more commercial harbor could have a more extensive industrial area being build on it.

Have some small fisher villages along the river outside of the big town.

As you have already the river to divide the town, you can use it for your advantage and build the poorer areas on one side, maybe also with the industrial area near it, on the other side the more wealthier areas.

Have a big military base. For example the area SE with the few houses seem just redundant, as you already have alot of buildings in the norther area. Or if you prefer more civilian use, place a bigger airport, with enough parking space for cars, a area to park and repair aircrafts. Maybe also some hotels nearby.

With a possible airport in the S, you could build a poorer area between it and the main town area more in the north.