There seems to be lack of completion.
Since the size is really small, there is no need to spread assets out; you can place as many assets as you would like. To give the build some personality I recommend using multiple materials, playing with part properties, and playing with colors. Symmetry isn’t a requirement either.
Your cylinders placed on the floor have the default color and material, I recommend making it a brownish wood.
I recommend making the bridge more curved as well.