One of the most difficult things fluids and glass.
It think because of no sharp edge between the fluid and glass.
You use subdivision, which makes edges round.
Then also you have to cope with the table reflection, due to the round sphere of ink and glass.
Then there is also a problem with the reflection layers.
Glass in Glass out, and third reflection of the ink layer.
Overall I don’t find this a bad project. It good in my opinion.
But if you need photo realistic outcome.
Then you have a long road a head.
There is this thread Why is glass and water so difficult?
Have fun, let us know how you progress.