"In form 7-A which shows the list of candidates we are also putting their colour photos along with their names and party symbols. This is for additional identification of candidates by voters," Amitjyoti Bhattacharya, Deputy Chief Electoral officer, told PTI.
This list of candidates with photographs is displayed prominently across all polling booths, he said.
He said the measure was taken in the state for the first time as also being done on postal ballot papers.
"For this purpose, all candidates were asked to submit to the returning officer their recent stamp size photographs as per the specifications laid down by the Commission," he said.
However, it was not mandatory for candidates to submit photos. "It was optional, but used widely by all candidates," officials said.
The last date of the six-phase polling is May 5, while results will be out on May 19.