Consider the outfit, accessories and the amount of contrast you want in photographs. Pale, neutral and strong colours are all possible directions.
Prepare a small shortlist
Compare two or three product swatches with the outfit. Record the exact product code once you choose rather than keeping only a mood image.
Use a trial reference
A trial swatch or manicure helps resolve coverage and finish questions that a digital palette cannot answer. Keep the palette consistent with the confirmed result.