The Raw Image
With a little brightness and contrast, more detail emerges along with some grain which is expected in low light.
With Brightness and Contrast
One thing which you can do with image software (Paint.net) and not just a photo touchup software (Photoscape) is to actually manually adjust the output levels of particular inputs. This can lead to some interesting effects.

Brightening the Dark

Expressing in Blue
A lot of image and photo software have interesting effects. One of my favorites is a painting effect. Add a little blur afterwards and I arrived at this.
Painted?
Of course, sometimes another exposure and a different window offers more of that it!
Another Look