Nice work, EruSilme, and welcome to the Guild (belatedly)...
It was fairly smalll effort for you to make those mountains, but the fictional Company cartographer obviously spent a lot of effort drawing them. Given that amount of effort, I would not say your rivers are too detailed. Their width is exaggerated; a reasonable approach to depicting the wider vs. the narrower ones, so the exactness of their wiggles is not unreasonable. About how large is the island?
What real-world era, or equivalen era, is this set in?
Oh yes, I *AM* that guy watching the construction project. "Aren't you boys going to use some thicker mortar? You know that thin stuff isn't going to last long. And you put some bricks in backward on that last row there - I can tell from the pattern. " "The young today, they just take no care in their work. Why in my day ... "