*snorts* Senpai at people.
I haven't been doing people very long, but I had lots of practice characterizing animals. Mostly big cats, since I like the Lion King style.
People are just hard because you can micromanage them. And you can micromanage them because you know exactly what one should look like. Plus, they don't really have texture on their faces, so your pencil can't do much.
WHAT I DO is draw traditional with pencil/paper then take a well lighted picture and send it to my tablet. Then I color. I don't really draw lines digitally anymore, but I used to. I think it's a waste of time. Nothing better than the rough of paper and the scratch of pencil.
You can always trace over your pencil with digital lines.