A few things.
First of all, she’s hot. Looks familiar. Who is she?
Second, the realism mostly comes from colour distortion (tinting), as opposed to shape distortion. One thing that does not look realistic in your manip is the colour density of the glass. If it’s a chair, then the bottom of the chair that holds the butt should have more glass when seen from the side, and thus darker since you are seeing more glass. In both the blue and red/orange manips, it’s darker on top, which looks out of place.
Then the shape distortion. There REALLY doesn’t need to be any. The distortion is usually caused by the RELATIVE depth of glass you see. That’s how glasses work. If the lens is 1m in diameter and 1cm thick, the effect of magnification is the same as if the lens is 10cm in diameter and 1mm thick, if seen from relative distances away (e.g. 5m away vs 50cm away). That said, the relative depths of a glass chair would be very small. And since it’s the same as a magnifying class, it would only magnify what’s close to the center, and not alter what’s on the edge. In other words, the effect would be the same if you used the Bubble filter (or whatever it’s called in PS where you click on something and that point gets bigger like a fisheye lens). Both butts look a bit awkward since the edge seem either pushed in or pulled out.
Last of all, she is pretty hot.
