Re: Removing pencil marks - help!
I presume you haven't started painting in the background area yet. If erasing with a variety of erasers, like a kneaded eraser or one of those nifty white plastic ones doesn't remove enough of those pesky lines, you can always resort to trying to cover them with some additional layers of gesso. Keep layering on the gesso until you can no longer see the pencil lines. Keep the gesso thin as you go around the area of the figure so you don't have a built up ridge that shows an obvious dividing line.
Next time, if you want to put a grid on your canvas, try a pastel pencil or piece of hard pastel stick like Conte Crayon. Draw it on lightly. When you are ready to begin the painting, you can remove it with a damp cloth.
Maybe some others will be able to help?
I love cooking with wines! Sometimes I even put it in the food! -- Julia Child