I think you're confusing me with AntoniaTiger, which is going to be confusing since we're giving you slightly different advice. If you want the swimmers to have higher bump than the skin then you need the bump map that comes out of your blender to be brighter in the swimmers area than in the skin area. If you expand the preview on that blender 4, you'll see that isn't happening. Here's one way to make it happen. The math node brightens the whole bump map which is then fed to input 2 on the blender. Input One gets the unadjusted bump map but the input colour is set to 50% grey to bring down the bump strength by half.

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