Went to a sketching session at the National Gallery of Victoria. We were tutored by Rosslynd Piggot, and we stayed at the glass and ceramics section of the museum.  We used paper, pencils and gum erasers, and we were focussed on getting the lights, shadows and reflections. Rosslynd has told me that you need to draw things as how you see them, but use your imagination too.  Then you subtract and add details with the gummy eraser. It was enjoyable, and it was cool that we had a show and tell at the end of the class too.