In the attached pics you can see in the render that the glass is bending or distorting the stuff behind it too much. Look at my poor biped being stretched.
Also, remember to take the reflection all the way down to white and check “Fresnel”. That way, the amount of reflection will vary based on the IOR and viewing angle, just like it should.
A glossiness value of 0.18 is way too low for glass. If you want glossy, then you probably shouldn’t go lower than 0.9.