Airplane Wreckage!
This is an interesting study on freehand visualization of atmospheric perspective (huh?)… Atmospheric perspective is the brain’s differentiation of near objects versus far objects.
When you look at an object, it doesn’t have a little black line around it. You brain, however, differentiates different objects by “drawing” or “seeing” lines around individual things. We can build this into art by drawing lines of different weight.
Typically, your brain resolves thicker and darker lines as being nearer thinner and lighter ones. So, in the case of these drawings, the outlines of the airplanes are thicker than the backgrounds. Also, nearer features of the planes themselves have thicker lines than farther features.
Both of these drawings were outlined in Copic N0, inked in with Faber Castell 0.3mm pen, and detailed with Copic marker and Posca white. Both drawings are on marker paper.