ref http://twittey.deviantart.com/

What I thought I already knew, but actually learned today:

1. Know what the main areas of value are (understand what the light is doing) rather than chase the correct values while rendering.

2. Know when to stop.

3. Practice rendering more geometric shapes.

4. While working, don't forget to eat. Or blink.

Getting totally immersed in work is a gift and a curse.