With the 2 images below you can see the major steps I took to complete this drawing. This includes one important bad decision I made but learned a lot from, in the image right below, the 3rd figure from the left. This was a result of losing perspective of the whole picture. Instead of working on shading shapes in a close group of values, I should do a value study first, understand the big value differences. Keying and setting the values in the small study then apply it in the big drawing.
So a better progression could have been like this (image below), skipping the part where I forgot about the big impression.
The final drawing. (image below) Note the differences between the value study on this image versus the one on top. I also had to improve on my value study quite a lot and thus my values on the big drawing.
