/ic/ - Artwork/Critique

Where might I find clear perspective exercises (especially in video form)? I can read PME as suggested in the sticky/wiki, but I want clearer exercises that define clearly the organized method of perspective. Though, admittedly, I have not read the whole book. Should I just continue reading to find the skills I'm looking for?

I understand concepts like the horizon line and eye level, HWD, and relative distance sizing, but applying the understanding of these concepts is where I feel I am lacking. For instance, I tried to draw a simple head with a downward angle, but it came out seemingly direct to eye level.