You may not use ANY editing tool to move, remove or duplicate any element of your photograph that would change a typical viewer's description of the photograph (aside from color), even if the tool is otherwise legal, and regardless of whether you intended the change when the photograph was taken.
The clause "aside from color" is not a license to remove major elements by painting them with a blending color. Advanced Editing rules are "results-based", so there's really no such thing as a "legal" or "illegal" tool; it's just a question of what is done with the tools. So whether the heads were "cloned out" or "painted over" is irrelevant: both were major elements, and both have disappeared.
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