The center must hold!

The biggest problem with most draughtsmen is that they keep changing their referential. They align the nose with the nipple, then find the hand should be more to the left by comparison to the navel, but then the wrist has to go further up, then this screws up the left eye, and so on. One can only hope that at some point this process will converge to a stable solution, but I don't know if it does or how long it takes, I just know that there is a better way:

Make an alignment of which you are sure, say, that the nose is aligned with the right...navel :)... or something...anything, as long as it is not too small a detail. Make sure of that alignment and stick to it. Compare all else to that one alignment, by checking angles, measures, and alignments. Do not deviate from it. Ever. Sacrifice everything to it. The center must hold! You can always win the day as long as some order can be had.