Using your blank penciled strip, lightly pencil in your dialogue and cartoon, then divide the strip into panels. I use an HB pencil, if you use a pencil with too hard a lead it will dig into the paper making it difficult to erase. Back when I first started working on a single panel, I worked with a blue pencil, they do not reproduce. As my sight began to degenerate I had to switch to graphite. If the lead is too soft it may smudge (as shown). If you have trouble with the composition of your cartoon try and approach it from a different angle. There are many different ways to approach a difficult scene.