Below you can see the progress of the wine decanter. You can see the refinement of the shapes and reflections. I corrected colors, softened edges, and added highlights.
Many people are confused by representing transparent glass. Like painting anything else, one begins by carefully observing and slowly building up the correct shapes, colors, and values. It doesn’t happen all at once. Every time I sit down to paint, I compare my painting of the decanter to the actual decanter and try to observe differences. I’ll say to myself “the dark ring in the base should be darker and cooler,’ or “there is a bright yellow highlight on the neck that is lightening the whole area,” or ” the left side of the base should be much lighter than the cloth it’s adjacent to.” I make these changes the best that I can, knowing that I’m slowly getting more accurate.