It's partly a product of my tools, I use pigment liners and colour pencils, rather than digital, very few people these days use those tools to put content online.
It also has to do with your style and colour choices with those tools.
You use the pencils almost like a paintbrush, using your strokes to add texture. The shading lines parallel to the source of the shadow and the consummate V's under the kobold's eye as a subtle hint at scales isn't a choice that everyone would make, and both of these make the sketches just that little bit better.