Whenever you design something, it is important to include equality and quantity to the design if you want it to look right. Imagine designing a building; you must proportion the design correctly and be sure that the symmetry is correct or the building may appear lop-sided, out of shape, or could potentially tear down over a period of time. The same applies to art.
I can't see the rest of the answers but I assume that there is a answer saying he basically wings it. hope this helps
I attempted a reverse image search for it on Google and the only result I came across was texture, though I believe that's just a description and not the name.
The "Tip" is the part of a pen that conveys ink to the drawing surface.
