Make global adjustments on each example:

Post your corrected versions of all three to Flickr.

Select your favorite of your partner’s photos that could look better with some adjustment. Tone it in Lightroom. Your partner will also adjust the same photo. Compare your results. Post both versions titled with each of your names to Flickr in a way that we can see them side by side.

Now, reverse it. Your partner picks their favorite of your photos. And you both adjust it. Post the results.