1. That is too detailed sketch.
Usually sketch for painting is not done with this much of detail. Specially when it is about to be used with oil paints.
You would say - i do it.
May be yes, but you see doing that much detailed sketch on canvas is challenge in itself. I know because i have tried it.Canvas is not smooth enough to make sketch on it.
2. If the sketch is that detailed, there is lot on graphite on canvas. This makes painting dirty.
3. If it were just a sketch, what it is doing on aisle???
Domp worry not punishing score for this. That was just ramblings from painter in me.