I have doubled all the dimensions in the quarter-size study and transferred them onto this 24 x 30 linen canvas. I paint while I draw, so there's no line drawing as such. I fill in values as I go along. This was done with burnt sienna and burnt umber for the darker values on a warm-toned canvas.
On the left, you can see that scrubby bush and a companion a bit clearer. This is all very rough at this point...just placement of different areas with a focus on shapes and values and whether they are all working together well. It gives me an opportunity to study the painting as a whole.
I have yet to understand how artists can totally complete one area of a painting at a time. I learned to develop the whole painting...keeping all stages pretty much the same. This is what I do.