Facing the face

I'm doing studies and exercises for this month assignment 'bout the face. The construction part is decisive. I've always thought of the structure as non-drawing and more like geometry or technical drawing, but, as i have been progressively persuaded in this course, planning, studying, structuring, before actually painting in a definitive "must".

Learning to fly draw/paint by the numbers has a different feel to it.
Even though, my inner-self taught-self fights me still on that, to the point i have to spell the process with a step by step list, so i don't forget its important role (structure) in the artistic endeavor of a painting.

I used to take my ability to scribble for granted .Oh boy, was i wrong...

That aspect on its own is one lesson to learn i am appreciating the most (with the usual struggle hovering as a tempestuous dark cloud) causing a grinch in my face as a reflex to my failure  in understanding the real concept behind this step, but i'll post it anyway, and i'll post again and again, till i get it to satisfaction (that's a tuff one to achieve though).

Enough and here it goes:

Some more face studies:

Some more development on that plotting light and shadows:

Adding color to it:

The lighting process is amazing. I still have a lot to work on my craft, i know, but right now, studying those matters is the most interesting part of the journey: