It may be impossible to tell from a pic. There are a ton of Cirrhilabrus species that have similar looking fish when they are in their female or juvenile phase. Unless you know where it was collected to narrow it down, we may not be able to identify it for you. If you bought it you can ask the store if they have a shipping list. The stores I go to have their list with the Latin names on them which is probably your best bet at a positive id