Also, how do you do fur textures? I have no idea.
There's a video on youtube that shows you how to do that. But, I'll explain it the best I can. Once you have colored in your character the way you want him/her to be, save it. You don't have to close it, but then, go to FeralHeart, Media, Textures. Look for ones that have "Shade" on the end. Suppose, you're doing the head.
First, you would go to your texture folder and open "cheadShade". If you're working on Gimp, open it through there. Select all, and copy. Then, go to the preset you're working on, and click past. Mae sure you get it on it's own layer. Then, on your layers panel, you change the mode from normal to multiply, and it'll do the rest.
I hope this helps. If not go to youtube, and look up FeralHeart preset tutorial.