The posing is good, and there's a decent amount of variety to the characters in the scene. You've kept the figure in a good place to be seen instantly, and also ensured she keeps the focus with good use of lighting and shadow.
The only drawback I can see are that the contrast is quite jarring between the bright main body of the scene and the black foreground and shadows. It's possible this was intentional to draw focus towards Syrissa, but I would argue the same technique could be used by using a dim ambient light source. It only needs to be bright enough for the foreground to have the same depth as the background, without stealing the focus.
Another technique to ensure she retains the focus is depth of field. By focusing the camera on Syrissa the foreground becomes slightly blurred to draw the eye away and onto the in-focus areas, which would be the layer where Syrissa and her onlookers stand. This way you can still have a visible foreground without harming the impact of the image.
As an additional option, you can tint the ambient light with a mild blue colour to emulate moonlight, so that it appears more like night time. You could also use some small light-orange lights for streetlamps. After all, which modern city these days is devoid of its own lighting?
I hope you'll take this critique as my suggestion to you, one artist to another, for improving ourselves and making good artwork great. You've proven you have the skills to create fantastic art and it would be a pleasure to see you develop those skills further. Keep up the good work.