Bianca linked to this article about game design but applies to a lot of visual stuff.
2. Talk it out, look at it from every angle
3. Do it
but a whole lot of stuff dies at 2.
It's easy to pick things apart, harder to make art, just make it even if it's not perfect better to make then to just sit there tearing other stuff down. Find a way around 2 if you have to.
2. DO IT
3. then talk about how to do it better next time.
Words are great, but they're coming into your brain through the narrow bandwidth of the intellect
Picture sound combo's flow into your whole brain easier and at a more base level.