Dunno if I put this in the right category at all, lol.

This is my most recent work in this field, a light study. It was done in 15 minutes using a small metal bust of... um... whoever the heck president that was.
This is not a finished drawing. The way Guy teaches classes, he gives you a certain amount of time to do the thing, ranging from 5 minutes to as little as 30 seconds. (seriously.) This teaches you to not sweat the small stuff and not kill yourself over details that dont actually matter and actually you end up drawing way more accurately.
Before I did this, we had done 8 of the same exercise, except we only got 5 minutes and 4 busts, and each bust was drawn twice.
This specific lesson was to get the face drawn loosely and quickly and not try too hard to make it look like the guy. Then go into detail with the shading, but to do it quickly once again. The amazing thing about it is that it starts really looking like the guy once it's haded, even if the lines did not. (This is a reason it's so hard to draw characters like Darth Vader- they just don't look themselves without heavy shading!)