A black Sharpie can be a quick fix for a scuffed black shoe. This way you will allow the heel of your shoe look whole; the damage will not be apparent.
Build a good shoe collection so you variety to match with different outfits. You are going to have much better results if you can coordinate your outfit with your outfit.
If you are buying shoes for a child that is just learning to walk, the function is much more important than form. When toddlers start to walk, their feet need tough shoes to protect the feet from injury. Tennis shoes are perfect for them. Stay away from shoes with slick bottoms as they are more likely to result in slips and falls.