*Exactly which elements to include (faces? items? background?)
*The proportions and angles of all the elements and the placement in the painting
*Which colors and techniques to use
I use to make a lot of different "studies" where I test proportions and angles etc. (Sometimes it takes days to decide). When I've made up my mind I start sketching on the canvas.
Right now I am at the study and decision-making phase. The key is not-to-give-up!