I like to line traditionally, it's faster that way. And much more easier, I think. But I color digitally.
So, I first draw with colored pencils on usual office paper, then I line with liners, then I scan it and clean the sketch. Then I fill my lines with flat colors in SAI and only then I start coloring in Photoshop.
Sometimes I envy people who can draw and color instantly, without this kind of preparations.
Coloring process videos are still on Livestream https://new.livestream.com/accounts/3821424/events/3189316 Someday I'll make them faster and with proper music. Someday.
Also I put my Work In Progress stuff, including sketches and lines, on my Tumblr. I'm not sure if they'll be interesting tho.