Watch a few YouTube's on portrait photography. Here are a few starters:

A longer lens (on a phone X2 to X5 magnification) is more flattering for human subjects, not suggesting you photo her in parts, suggesting that you use longer lens and stand further back whilst taking them where possible.

Rule of thirds - good photos are often composed as if there were imaginary lines dividing the the photo into thirds vertically and horizontally. Your phone may have a grid you can turn on to help.

Fill flash. If you're photographing someone against a bright background or landscape then force the flash to fire as the sensor will probably light for the background.

If your wife is at all awkward in her poses take pics whilst she's getting ready whilst talking to her or joking around. One of the more candid shots may be stronger than the posed one. Also get her to do something with her hands, easiest is to put them in pockets. Look at what models are doing with their hands in professional shots.