Sketch o' the Day

Hi MB. For your water droplet how did you get your lines so clean, a stylus? Thanks. WB

Hi, I am a beginner of both drawing and Paper ^ ^. I liked your post about how to draw droplet very much. But I stuck at step 3 on how to casting shadow with pencil. if I use the same color as the circle, it doesn't look like shadow at all; when I switch to black, it becomes even worse. May I know how did you do?