So, using the information from the photo, they built a model of the DNA structure. along with this, they managed to prove it by revealing Franklin's Photograph 51.
Soon after this, Watson, Crick and Wilkins received a Nobel Prize for either medicine or physiology. Since then they have been celebrated as discovering the secret of DNA.
Unfortunately, Franklin died due to cancer-likely caused by her continuous work with X-Rays. Some may think she should of been awarded the prize as well(though she was dead) but Nobel prizes may not be awarded to those who have died.