One of the frustrating challenges when drawing my comic is drawing small heads/faces that look "right." When I work at a larger scale (say, covering most of one sheet of 9X12 sketch paper--see below) things look okay and even produces a reasonable likeness of my "model." But when I work smaller, like in the panels of my comics--unless I "cheat" and use the lightbox to trace a photo which only works if I
have a photo from the correct angle--results look like crap.
I originally thought that smaller views, since they had so much less detail, would be easier. If anything the opposite is true.
Example of larger image that I think is okay:

This is a pretty good rendition of what the nursing student in Cold Servings is
supposed to look like.
Example of smaller images that I think look like crap: pretty much any random page of my comic.