There are many ways to color. In this tutorial, I will show you one of the many ways. This approach is easier than most, in my opinion. Hopefully, by the end, you’ll find it easy, too. ^_^
Once you have your lineart, use the magic wand tool and start selecting the places where you want similar colors to be. Here I’ve selected the leaves. Make sure where you’re selecting is a closed object -no gaps between lines- or else the wand won’t work.
After It’s selected. DON’T START COLORING YET. Now it’s time for the trick. Go to the pulldown menu: “select > increase by one” This will increase the area you’ve selected while keeping the shape (if you think it’s not enough, increase by one again). Now, using a large brush scribble the color in. Repeat the process for every color. Each separate object should be on a separate layer (eg. The leaf color is on a different layer from the skin.)
******Note: After the trick with the magic wand, there might still be some white spaces, especially around the hair. Use the thin gauche tool to fill the little spaces in.
Go to your lineart layer. If your lines were done on the computer, then this will work great. If not, then it won’t work at all. ^^’ Now, you can paint over your lines!!! Isn’t that cool? xD Just select a darker shade of the color near it, and brush away! Doesn’t that look much better?
Now to give it an unique look, instead of the plain, smooth CG-ed look (which I dislike. A lot.) Go to the pulldown menu: “File > Save as” The window will pop up. Go to pulldown menu ‘save as type’ and select ‘Photoshop format (*.psd)’ Now open it up on photoshop and start overlaying patterns. ^_^ Experiment with textures/patterns you have and see which ones look best. I decided this looked worse than the original for this particular CG, but it’s a technique you can use.