There isn't an outline

While many artists draw with an emphasis on lines, I use light and shadow—contrast—to delineate surfaces, much like a painter uses color. In that respect, my approach to drawing is more like painting. The only lines visible are those used to portray a texture in my subjects. They’re very rarely, if ever, used to separate one surface from another.

This approach mimics the way our eyes see the world. When one looks at an object, there isn’t an outline that separates it from its background. The separation is achieved through variations in color, light and shadow. - David Bjurstrom

Zaczarowana dorożka.

David Bjurstrom 

Skutterudite

Mousiemasala.tumblr.com