Here's another of my little still life paintings.
It's a good exercise to try to render various different surfaces and textures convincingly.
With reflective surfaces I find it is really important to surrender yourself to the lights and darks that you see in front of you rather than thinking about the contours that you know to be there.
The edges of this goblet are hardly defined at all, and the elipses are a bit wobbly, but because I've got the reflections pretty much in the right places, it reads as a solid goblet.
