I used a similar app to try different styles and colors. Once I figured out what I thought looked best, I went online to shop for wigs. Most of the full-coverage wigs were too hot, so I switched to toppers. The hardest part is dying my hair to match the color of the topper, but I eventually figured it out.
Some apps will let you try makeup the same way. Try different colors of lipstick, eyeshadow, etc. There are some that will let you experiment with eyebrow tint and shapes. It is a great way to experiment for free.
Don't just go by what you like. Ask a trusted friend what they like. If they pick the same ones you did, you have a winner!