I’m having some trouble making hard, crisp edges in my drawings. I’m trying to draw as realistic as I can, so I’m defining edges with tone next to tone rather than with line. I’ve gotten really good with soft edges and lost edges, but my hard edges look soft. This happens even when I place a dark value next to a light value, but it’s especially true when I place two tones together that are close in value. What can I do to get hard, crisp edges and maintain realism in my drawings. Thanks!