There are a lot of things the mind processes and goes through when doing observational drawing. I find that my mind switches modes of thinking here and there throughout the whole drawing process. Take for example, in the second example, I didn’t have much difficulty just going with the contour, but I couldn’t do that same thing with the third example. In the third example, I focused on having the thigh right and then worked out from there. In the last example, i used the line of action to guide me through the whole process.
Blocking in (or Block-in) is the first phrase of drawing. There are many ways to go about it, and it’s even possible to switch between two or more strategies. There are Gestures, Angles, Envelope, Shapes/Forms (and a few more). This is a very important topic that I’ll surely talk more about in the future.