In this very interesting demonstration, Caroline started with a pale green wash, onto which she loosely sketched the shape of the straight sided bottle. Then she put in a white background around the shape.
Using a flat brush she painted in the four corners and the base of the bottle, then the round neck. A lighter tone of the green base colour filled in the body.
Caroline said that the complex and numerous shapes and reflections could not all be recorded, so we should select some shapes that appealed. A green bag and red bauble that were behind the bottle were incorporated.
Keep the highlights until last and use a rigger and white paint. When painting round bottles, make sure the ellipses match. Caroline finished with some shadows thrown around the base of the bottle.