when I am trying to render some liquid in transparent glass, the result is not good enough.
I tried change render settings and import settings like tesselation, nothing helped.
tesselation 0.1 render
tesselation 0.9 render
Is the liquid occupying same space as glass, they would need to be separate I think, if you could deform the top so it has meniscus and ripple, it might help too.
Check your IOR if you can in Keyshot, internal reflections, perhaps try to get reflections to falloff quicker.