Some would say to consult a professional stylist BM and that's fine, if you have the readies.
My way was practice and experiment with a lot of failure in between.
Failure of a very cringeworthy nature too, like this; My very first contribution to "pics and looks".
Girls of your daughter's age will have had more encouragement and opportunity to find their "style" than many guys of our generation.
Don't ever be misled by some women appearing effortlessly beautiful, they've been working on it all their lives.
For myself, I keep my eyes open, observe and store for future ref.
Inspiration can come when least expected and unlikely sources. I have only one rule, I'd never copy an outright teen girl fashion, I learnt that lesson.
Steve