For textures, layer effects and the magic wand tools will be your best friends, the latter more so for cutting around the character. You can duplicate layers to mix the effects to create one type of look (IE: in the abandoned edits, I've used both multiply effects and no effects to create the moldy look), though be weary- you do want to edit the character, but you also should make them recognizable.As for the tears and holes, the easiest ways to do this are as follows:Method 1: Create a new layer and use the lasso select tool to make the shape of the holes and tears you want. Fill them all with black, deselect everything, and then hit it with a light Gaussian Blur. Looking at your gallery, you seem to be really good with this one (notably on your Withered Toy Freddy and Nightmare Classic Bonnie).Method 2: In regards to FNAF, you can use the damage from other animatronics and apply it to one character. Let's say I want to take a spot of withering from Nightmare Fredbear and want to apply it to Bonnie. I would copy/paste the spot from Fredbear (leave some of the fur around it for the next step, don't just copy the hole), use the eraser tool set with low hardness to erase some of the fur, and put it where I'd want to put it on Bonnie. The next step is kind of subjective- you can either use hue/saturation to match the color of Bonnie's fur, or you can make Fredbear's fur black-and-white and use a layer effect. An example from me is on my Toy Molten Freddy edit , where a hole on his snout was sourced from Springtrap.