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I'm not an expert on spark plugs but what those tell me is that (1) you have had water in your engine room that has rusted the outside of the plugs (ie, that rust could be an engine problem if it is the head that has leaked that water), (2) the first two plug tips look just about a perfect "toasty" brown, and (3) it is not unusual for the last two plugs to show signs of a richer mix.
So my read would be that you need new plugs, make sure the plug wells are free from water, and probably look to the carb, fuel, or ignition for causes of ill-running.
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