updated the scene. closed the hole in the floor right beyond the glass which was used to light the glass. because of that I had to push the bottom geometry of the glass a bit upwards to get circular refractions again. also added some loops to the liquid-air geometry and smoothed it to get the shape right. before the piece of geo looked like a convex/concave disc. also worked on the wine shader and added a SSS-layer. still needs some tweaks.

for the lighting setup I deleted the light planes and used used a hdri image nothing else. the image file is a bad one i have to find some studioSetup hdris somewhere.