Another study that I recently completed was one of warm and cool colours. I based this study on a photo with all of these colours. The objective of the painting was to get the warm light to shine through some of the grapes and present the overall play of the light with the bunch of grapes.
There is some grapes missing at the bottom of the the bunch, but since it is a study, I did not go back to modify it.
Bunch or grapes
Francois' Art Blog 