Sorry man but you are totally wrong here. There is indigo in this shot as the girl is wearing jeans, and to quote directly from the wikipedia page for jeans:
"Traditionally, jeans were dyed to a blue color using natural indigo dye. Most denim is now dyed using synthetic indigo. Approximately 20 thousand tons of indigo are produced annually for this purpose, though only a few grams of the dye are required for each pair."

And to defend @bescouted this is not porn. If you want to see some porn on steemit you should look through the nsfw tag.

This here is fashion photography.