Well what color skin does the spankee have? I think if you want a realistic shade of red using a program like photoshop, you can choose a really true cherry red, turn down the opacity of your brush to say, 15-30% and use it to color the bottom, doing it multiple shades till you find a good one. I suggest using a bigger brush to make it look a bit smoother. I don't know if that helped, but from what you were asking I thought that might help.
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