Hey manlybrian, good to see you workin hard
Some of your pencil studies (like in 167) look like they might be suffering from a lack of preparation or underlying sketches. it looks like you're taking a very soft lead pencil (like a 6b) doing an initial sketch with that and then going over it. Generally soft lead pencils don't look too good unless they're going over some already present lines or they're sharpened to a fine point. Shading right off the bat with a soft lead is going to look really rough.
Also, observation is key with studies. make sure you're observing every little thing and comparing it to something else. Some of the eyes on your people are looking a bit "symbol-y" rather than observed, real eyes.
So all in all, draw a little slow, a little larger, and worry about the structure rather than the shading. If you're going to do shading with broad areas, start at a harder pencil and work your way to the soft ones.
Anyhow hope that helps, keep kicking ass