Making progress...

 This painting is coming along.  The purpose of this layer is to model each object with color trying to get it as close to finished as possible.  There will be another layer of fine tuning, then one for glazing.  My biggest challenge is not to rush this stage.  Especially with the complicated shapes such as the drill.  I start with the overall shape then work my way down to the finest detail, trying to describe the turn of the form in space as the light travels across it. The other challenge as always is not to overpaint the shadows, they have much more punch if left somewhat transparent, allowing bits of the underpainting to show.