I did a very basic example with just her face. Use a blender node or a mix node depending on your shader setup and the key by the blending (or fac). Have the first shader set up plugged into the top and the second plugged into the 2nd color input. Then use the animation pallet to control it. I 15 frames of one color and 10 for the transition.

And here is a sample video. I used preview for speed, but this will work with any of the render engines https://youtu.be/cFmM1XcSbCI

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