Two people were left with "life-changing" injuries when a corrosive substance was thrown on to them through their car windows.
Cousins Resham Khan and Jameel Muhktar had been celebrating Ms Khan's 21st birthday before the attack.
John Tomlin, 24, is described as white, 6ft tall, of stocky build and with short fair hair.
The new images show Mr Tomlin, who has distinctive hand and face tattoos, entering a shop in Romford on 3 July.
Mr Tomlin is also known to frequent the Canning Town area.
Ms Khan, a student at Manchester Metropolitan University, and Mr Muhktar suffered severe burns to the face and body in the attack on 21 June.
"Within seconds, my cousin started screaming. Her eyes were blistered, her face started melting. My face started melting", Mr Muhktar said.
According to police, they had stopped at traffic lights when the man approached them and threw the toxic substance at Ms Khan through the window.
The attacker then circled around the car and threw more of the acid at Mr Muhktar, before eventually fleeing the scene.
Mr Muhktar, 37, had to be temporarily placed in an induced coma to treat his injuries.
"I'm in a really bad way. I'm going to be scarred for life. I can't walk properly, I can't hear properly, I can't sleep", he said.
Police said the incident is being treated as a hate crime.

Billy Muir's roles include firefighter, rubbish collector, lighthouse keeper and airport worker.
The 67-year-old, from North Ronaldsay, who also works as an electrician, builder and tour guide, was honoured with a Pride of Britain award.
His volunteering efforts were recognised at the ceremony in London on Monday.
Mr Muir was hailed by the awards organisers as Britain's hardest-working man as he picked up a Community Partner award.
The father-of-two said he had no plans to retire as he enjoyed working among the island's 50-strong community so much.
He told BBC Radio's Good Morning Scotland programme: "I've been the lighthouse keeper at the North Ronaldsay lighthouse for some 47 years.
"I've been a firemen on the island for the Scottish Fire and Rescue team for 33 years, and a fireman at North Ronaldsay airfield for about 11 years.
"And I've been a contractor on the island for most of my working lifetime."
Mr Muir added: "I've spent most of my life in the lighthouse service and that means a lot to me.
"It's something you dedicate yourself to doing as long as you're able to. There is no retiring age now and that's the reason I've clocked up so many years.
"It's made me very happy, and it keeps me fit. As long as I keep fit and healthy I've got no plans to retire."
Mr Muir says his volunteering work, including that as a retained firefighter, is borne out of necessity on such a small island.
He said: "If you're a willing hand you get lumbered with the job.
"But we're a very close-knit community and we rely on each other all the time to keep the island going. The sheep are a major part of that because it takes the whole island to round them up.
"It's not an easy task to round up 2,500 sheep on a shoreline. We're like one big family."
Mr Muir's wife Isobel, 76, said: "He does a lot of work for the community when I would like him to be doing more work around here."
But she added: "It's worth it. I've often wondered where the island would be if he didn't do all those jobs.
"He contributes so much to everything that goes on.  It's an ageing population and he's one of the people that's still strong and fit enough to do all this work."
Police have released new images of a man they want to talk to in connection with an acid attack in east London.
[NEXT_CONCEPT]
An Orkney sheep farmer who holds down a total of 20 jobs has been dubbed Britain's hardest-working man.