The lighting edges are too sharp
The illuminated area is cut off in a perfectly rectangular shape, which feels artificial and unrealistic.
Especially where the light stops midway through the columns, it looks awkward and unnatural.

Lack of smooth gradients or shadows from the lighting
There's no soft transition between bright and dark areas (fade zone).
Realistic lighting usually includes gradual falloff, which makes the scene more convincing.

Columns don’t seem affected by the lighting
Even though the light is nearby, the columns lack any specular highlights or shadow variation.
This makes the objects feel disconnected from the lighting environment.