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And if all else (modifiers) fail, just poly-modelling it usually fixes all the errors, but it takes a bit more time :)
to represent image realistically, you must take into account all phenomena that occurs IRL
no glass is perfect - it's imperfections and medium/vol. properties that characterize half of it , other half being the environment (could use better one, more dynamic to get a play w/ caustics)
here's a bit leveled up to get you going further... you can also add roughness/dirt, turn on dispersion, change env...
Hi, I reproduced your model on the right and can't say I see any issues here either. When you say seems to be incorrect, can you share with us how it's meant to be?
Check if bottom of the glass doesn't touch ground plane. It should float slightly above the ground, otherwise there's a risk to run in z-fighting, which leads to visual artifacts similar to that in your attached picture.
What about your visual reference? What should it look like?
Hello & Welcome!
Care to make it easier to help you and provide a scene with a reference image?
Since issue can be anything from bad geo, lighting, materials...
