Is the Glass realistic?

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Yes and no. I think you have nailed the color and glass material. If I look at an open bottle of red wine the surface isn’t so optically perfect and, I think, that is what struck me about this image.

You can take a look at blender guru’s tut, he had an video on glass

The glass looks a little too saturated:

Thanks. I will pay more attention in the roughness and volume.

In second picture the bottom of the bottle looks weird like it’s made of different material.

Colored Glass needs absorption. So you see the dark areas when ever you look deeper into the glass.

Strange… in this pic i change only the focal length to 20mm.

Strange… in this pic i change only the focal length to 20mm

Yes, I understand that, but the bottom seems to have different surface. Upper part is smooth and bottom is more coarse.

I change the angle and now i can see, this is the table. But i don’t know how to correct this.