Giorgio Morandi is one of my favourite still-life artists. I love the pared down simplicity of some of his paintings, and the way his work always starts with the intense observation of a carefully arranged selection of objects.
In order to get down to the description of the object's essential form, Morandi used to paint his bottles and pots in a solid colour. This means that the artist is not distracted by labels, and won't get way-laid by the fiddly, transparent effects of glass.
I painted a bunch of bottles myself in different colours, some matt, some gloss, and I have found painting them a terrific exercise in the rendering of light and form.
Here's one of them. The original is only 15 x 20 cms.