I’ve had questions (Yay!) on improving sketching so here are some suggestions… pay particular attention to the beginning of these. I start very loose and light so that I can nudge those lines and values as I go. I’ll also darken as the sketch pulls together. If I try to get the “right” line the first time, the sketch becomes too stiff and flat. The longer I can keep it loose, the better flow and form I can achieve. Hope that helps a little!