Painting 1 -- Fabric and Bottle

At one point while I was painting this relatively large 18 inch by 24 inch oil on paper still life, the professor came up to me and said, "Is that really the color you see?" To which I replied, "Yes, of course. Why?" She then called me closer to the front of the class. I had been painting the wrong color all the time. She then calmly said, "You'll have to be more observant if you want to paint realistic images." She is a wonderful teacher. Ah, fabric and bottles. Again.