Inking Digital Artwork?

[Drinks]

The way I ink is pretty basic, and with all these posts I'm sure someone went into it well enough.
A way I use to color, a lot of people ask so I'll share it here.
I use photoshop, and there are other ways to get into it but I find the easiest way is in the layers tab.
At the bottom is a circle half of it darkened, click on that and a dropdown menu will pop up, go to curves...
For darker colors, move the graph down, for lighter, move it up.
I usually have 3 of these layers for shading, one for shades, 1 for lights, and 1 for any other color effects I'd like to add.
You will need to paintbucket the each of the curve layers black so they dont mess with all the colors isntead of where you want the shading, and then just paint on white on the curve layers.

I'm very bad at explaining this so I'll post up some screens if people want more details.