Triptych on Unconcious Inferences of Visual Perception

There are a lot of assumptions we make without even thinking that help us make sense of everything we see. These things that we have learned from experience and generally hold true only become apparent when things start to look a bit odd. I've illustrated three of them below.

I: Light comes from above

II: Faces are presented upright

III: Objects are usually viewed from above

Casper, the friendly dog

At the moment I'm experimenting with drawing negative images and then inverting them once I've scanned them into Photoshop. I've been checking how different techniques turn out once they're inverted, because it's quite hard to tell when you're drawing it. The more you work it up, the wronger it looks. I'm pleased with how this one turned out. The finished image is shown above, the picture below is what I actually drew. I really like the painterly effect, and how it turns out blue-tinted. I think I'm going to be doing more of this.