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Thanks! :D Anyways, in the future you should focus on having a light source in mind, for example then it makes sense to have shadows under the arms/between the legs/bottom of the head etc because they're covered by something. :) So yeah, every time you shade something you should think "Hmm, is this realistic, would it look something like this in reality?". In the end you'll find a good and realistic way to shade if you just have it in mind when making every skin.
Hope that helped a bit. xD