Nice job! Impressive what you can get in very quick renders.
I think the lights aimed down at the wall could use a little bit of fog below them, creating a faint glow beneath the light.
The light hitting the wall cuts-off in a very sharp edge, I’d like to see a bounce light around that area to help simulate light bouncing off other parts of the reflector, just bleeding a little bit above and outside of the area being lit.
If the wall segments had different textures, or the texture didn’t line-up the same on each segment, it could add to the realism.
I like to do blooms and glows in post. You can get render a very quick pass of just the bright lights themselves, then screen blurred copies of that pass over the beauty pass to add the glow.
Some of the light colors could be richer, especially around those red lamps. You could take more advantage of specularity and reflections – imagine if the red lights cast red specular highlights into otherwise-dark parts of the fence, or how neat it would be if the sidewalk were darker but had some wet spots and puddles on it…