One great thing about digital storyboarding is that it makes it easy to experiment with lighting. The shading and color effects can be added on a separate layer behind the line art, so if they don't work out they can easily be deleted without damaging the original.
It's easy to get carried away and over render your panels. But on the flip side - you can also use tones to pull masses together out of very rough sketches
I'm just starting to get my feet wet here - but by later episodes I really dove in. Hope you like them.