Here are a few quick tips:
- Head shaped like potato happens when lines are abruptly terminated: it sometimes helps to draw the outlines of the head ALL THE WAY to the top of the head (the two outlines meet on top).
I also started with a M4 already squinting.
- 3/4 photos. They should work fine. Please make sure that after you place the dots, the head's orientation is the same as the photo. This is important.
- I noticed that when drawing the nose, the less you draw is the better. What is meant is that the best is to draw just under the nose but not up the sides. (see illustration).