Thanks for the comment and question. The iPad screen is 9.5 by 7.31 inches....it's an iPad 2. I do stay zoomed out in the initial block in, which makes the image about 2 inches across on the screen, but usually zoom in a bit to work up textural details. If I forget to zoom in ( which is often) it starts looking a little too uncontrolled and sloppy when blown up. That said, I do like to keep the strokes as simple as I can for these, so I'll sometimes go over a sketch at the end with a larger brush to unify areas and reintroduce any looseness which has been lost once the value statements are resolved.