I get asked often 'how would you finish that'? This video answers this question. This part 2 video is less about each paint mark, and more about decisions, and staying true to the original focus (the white building in raking light).
1.5 x speed is shown (or in some areas more). Slow the video down or pause if you are painting along. It might be better to just watch this, and then try your own hand at finishing your art.
I'd encourage you to try to make your own white building painting. Start by seeing a structure in real life and walking around. Make some color notes (dots or swipes of color). Jot down the value shift you see.
Other videos to watch to learn more about this topic of buildings, warm & cool, sun & shadow can be found in:
Core - Warm and Cool
Library - Cityscape Paris (2 videos... watercolor and oil version of same Paris scene)
Class - Virtual Charleston, Urban Impressions