Can you give me some critiques on my mouth drawing?
I realized this is a quick drawing (took me around 25 min) and I should focus more on the form. But for the rendering part, I want to discuss with you about how to use lines.
One of my teacher used to say there is no line in drawing, there are just tones next to tones. But I do like the way some old masters did with a variety of lines. So for a realistic drawing, should I merge the lines into tone or keep some form lines and really care about the line quality (the different thickness, directions, etc)?