Heather Face Tweaks addon

This isn't a very noticeable edit, but maybe someone else will want it. I found Heather's textures to be really subtle with delicate shading that do suit her as an innocent, fresh-faced ghoul, but also that the lighting conditions of the game rarely do it justice and she ended up looking a little washed out/unshaded. This texture paints on some more noticable detail for her facial features and adds contrast to try to alleviate that. Affects only her default non-goth face texture (and her "heatherdamaged" texture, but that was the same as her default texture anyways).