Ask what is being observed
Separate the subject's visible relationships from a remembered formula. Compare proportions and negative spaces before adding detail.
Look at a working sequence
Where stages are available, identify the first structural choices and the later refinements. A finished drawing may hide the decisions that made it readable.
Test a short exercise
Draw the same subject twice with one change in approach. Compare the results and name what became clearer rather than simply choosing the more polished version.