I'd only bump up the iso if you felt you needed a faster shutter speed. It looks like you were going for fountain blur and you were successful. I like the look. Maybe if you went to 200, you could go a little higher on shutter speed to make the trees sharper and still blur the water.
I struggle to frame a good picture, but I'm thinking less water here and more trees and building would be good. Maybe keep the street light and bright reflection out of the view. Reflections look better on smooth water.
If you want the scene to look more like night, use manual exposure and give less of it, otherwise your camera will try to make it look normal like it does now. It all depends what you what. If you go for the nighttime look, then maybe try including the street light. It looks like a great place to have fun experimenting.