All this talk about underpainting and paper possibilities makes me branch out and rethink. Here is an oil underpainting for my next pastel....on Uart paper.
8x8 pastel on bfk
With the time change sunrise is much later. It makes timing quite easy for stopping my the side of the road for a little quickie sunrise painting while on my way elsewhere. This little hill is down the street from me. I tried to focus on what was important and not fuss with details. You ask, what was important? It's the two masses of contrasting values. I tried not to break up the land mass too much even though the house was lighter. Just a study.