Any good lithomancer will tell you he is meticulous. Any of his friends will tell you he is anal-retentive. Cuts tear across the person's chest. Skin gets evenly flayed off. Everything is nice and orderly.
Cuts travel horizontally and vertically and angles line up perfectly.
Now if you could only make the blood flow evenly. Enough drawings to build a structure is one charge. This generally means a ground plan, front elevation, side elevation and roof plan. Add one ground plan per floor. A building over five stories can generate two minor charges.