@pratyush: what I like doing is having a section of my drawing highlighted then I would use the soilds free form tool to color in a few parts of the highlighted section.This, I find is the easiest/fastest way to make clean shading or texture with out having to use to many tools. I love this tool its truly helpful if one knows how to properly use it. It is a two step tool as a pose to highlight, paintbrush/pencil, fill tool or paintbrush/ lasso then earaser.