Early last year, I did my god daughter's hair for my best friend. As I explained at the time of the original post, Li li has thin and fine hair, the complete opposite of my hair. If you have thin and fine hair too, one way to make your hair appear fuller is to do brick layer parting.
Check out these set of bricks and notice how the bricks are not stacked one on top of each other:
The vertical lines meet each brick right at the middle. That is what you want to do with your braids and twists. You do not want them stacked right on top of each other, rather yet you want each vertical part to be right underneath of a braid or twist right above it. When you do this, you see less scalp, which helps to make your hair appear fuller.
The best way to achieve this look is to style your hair one horizontal row at a time. When you get to the next row either below it or on top of the previously completed row, make sure you make the part for the next braid or twist right underneath of the braid or twist right below/on top of it. This is how your twists or braids end up with the brick layer parting.
Check Exhibit A: