Above is an 8x10 field study of a Palo Verde tree from the Lost Dutchman State Park. I painted this to use as a reference for future studio paintings.
Here is a detail from the studio painting. I referenced the plein air study in order to paint this one. I still think the plein air study turned out better, though.
Here is the full image of the studio piece. This painting measures 16x20 inches.