Good to see another Aussie on the board. I live in Melbourne.
Photos of coloured glass are best taken against a plain white background. Normally it is best to show (1) a general view, (2) A profile shot from the side, (3) a shot of the base - this often eliminates a range of potential makers, and finally (4) a shot showing the rim.
Try to reduce them to just below 125Kb each (that will be c.500x500 for very complex shapes or decorations, or 650x650 for very plain pieces.)
Ross