studies = from photos and life

[Fingus]

A mistake I used to do a lot is to measure proportions over rather long distances, like from shoulder to hand, nose to ear, etc. It's much easier to accurately estimate shorter distances like nose to corner of eye, deltoid to elbow, etc. Your mileage may way, but I feel my proportions improved once I started to just lay down rough outlines of the proportions and then work my way through increasingly smaller landmarks and adjusting the rough sketch as I fill in more information. It also taught me not to get too attached to what I have already placed down.