The title reminds me of couch potato which should be more interesting to sketch haha... (ok not funny at all)
Pick up a good technique for improving my drawing today, which is sharpening my pencils with pen-knife. Haha... yea saying something so simple makes me pai-sei. But it's a really useful technique and it helps to expose the pencil lead more so it's easier for shading. Notice how you can shape it accordingly to better suit your drawing technique (see my pen-knife sharpen pencils below?), like sharpening it more chisel-like so that shading can be enhanced.