I'm practicing on coloring techniques and higher quality art in my comic. Basically I take a break in between every step. (I.e. Draw the sketch, work on something else, then go and do the line art, take a break, do the base colors, take a break....etc)
I figured out taking a break in between most steps can REALLY improve the way you perceive your work, and it makes the quality a lot higher. I don't usually take very long breaks in between, I'll take like fifteen or so minutes if I feel like I need to do a lot in one night. Though, I'm more inclined to take longer breaks in between base colors, and detail work.