The puddle on the ground looks too.. smooth. I would like it too look a little bit more noisy and realistic. Changing color settings or roughness or IOR didn't help.
On node editor, you can try the following: add glass shader --> add glossy shader--> add mix shader--> add layer weight--> connect glass and glossy to "shader" in mix shader node--> connect layer weight node's "facing" or "fresnel" to "fac" in mix shader--> connect mix shader to material output. Instead of using glass shader, you can also consider using transparent shader