Abstraction

I run into a lot of people that don't understand the difference between abstraction and caricature.  Maybe that's because the meaning of the words has become muddy in common usage.  Artists in general would be better off if everyone was clear on the terms, though, because while abstraction and caricature are related concepts, they are problems that have to be addressed individually.

My definition of each is:
Caricature=Distortion and exaggeration of a subject's distinctive features
Abstraction=Simplification down to a subject's essential features, eliminating unnecessary information

Abstraction is one expression of a design principle called Signal-to-Noise Ratio, which states that the Signal is any information that is important for the viewer, while Noise is unimportant information which necessarily interferes with the signal. 

The key in any good design is to identify how much of the detail is actually signal, and downplay/subdue/eliminate everything else.  In other words, not all detail is noise---sometimes it's part of the signal.  The best way to judge whether a detail is signal or noise is:
- Does it say something important about the character?
- Does it enhance the overall style of the piece/property? (ie. Does it say something about the world?)
- Does it significantly increase the character's appeal to my intended audience?
- Will the audience be able to see/appreciate the detail or is it just adding clutter to the scene?
If the answer is no to all four, tone it down or cut it out!

So the level of abstraction in a subject is just an expression of the signal-to-noise ratio.  I usually have to consciously abstract things after my first designs, and I often don't go far enough.  I've seen other artists who have the opposite problem and simplify things so far that they lose their connection to their audience.  I think that's why it's a ratio and not a hard and fast rule; too little is too little, and too much is too much.

With this Goldcrest, at first glimpse it may seem I didn't abstract things at all, just used caricature to push the personality and distinctive features.  But while I wanted people to react to it as a real bird, the details themselves could become distracting really fast.  So I used tricks like alignment, color, shape juxtaposition, and contrast control to keep the eye focused only on what was important.  Of course, after doing the little abstraction example above I wanted to go back and simplify about 10 more things in this image, so I'm obviously still learning this principle.