I am using Clipstudio to make a manga too, but I sometimes work on illustrations as well.
I try to observe how other artists color their works and try to apply that to my drawings, but as of now, I'm still too green to pull what you can do. I'm always impressed by your coloring skills!
By the way, what pen tablet do you use? I use a Bamboo Pen CTL-460, and while it does its job just fine, I find it hard to draw accurately by drawing in one surface while my eyes are set on the monitor screen.