It was reproduced countless times over the following fortnight until their bodies were found in a ditch where they had been dumped by Huntley, who is now serving a life sentence for their murders.
A copy of the picture now has a prominent place in the family’s living room.
Mr Wells, 48, said: “She would have been 21 this year. She was 10 when she was killed, but she would have been 11 a few weeks later.
“That photo no longer impacts on me. We released it to the police during the 13-day search, because it was a very up-to-date one, the last photo of the girls.
“I don't want to talk about what it has been like the past 10 years, not now.”
Mr Wells spoke to the newsletter of Grief Encounter, the charity for which he will raise money by running the London Marathon on April 22.
Sitting in the family home in Soham, which is called Holly House and has a holly bush outside the door, he said he hoped to do “something positive” in his daughter’s name.
Praising the work of the charity, he said: “It is of course the kind of help we all hope that we'll never need to consider.
“We were in the news a great deal at the time following the loss of Holly and the charity wrote to us and asked whether we could get involved.
“I was genuinely overwhelmed when my wife and I found out a charity like Grief Encounter existed.
“I could have wept tears of joy and relief when I read the Grief Encounter workbook.
“It gave me permission to grieve for Holly for the rest of my life. I'm now proud to help this charity.
“We have met some extraordinary people through Grief Encounter since we became involved.”
Mr Wells, who runs a window-cleaning business, agreed to become Grief Encounter's founding patron after he and his wife Nicola and their 22-year-old son Oliver were helped by the charity.
He has teamed up with his friend Rob Wright, 38, to run the marathon and hopes to raise £10,000.
Mr Wells said: “We have met some extraordinary people through Grief Encounter since we became involved.
“There are some awful cases that the counsellors have worked with, heart-rending stuff, and the charity's services are oversubscribed. I want to do more to help if I can.
“I decided to do the marathon while we were having a drink at the house of a neighbour, who had done the London Marathon four times before.
“He said he wasn't going to do it this year, so I announced that I'd give it a go myself.”
Mr Wells, who has picked up several injuries in training, said he would “just be pleased if we get round”.
“I'll be doing the best I can. One of my customers told me she did the marathon walking, and it took her seven and a half hours, so if the worst comes to the worst, I can do that.”
He added: “Not only is this year the 10th anniversary of Holly, it's also Olympic year, and I realised it was a great opportunity to trumpet the charity, as well as do something positive to mark the anniversary.”
Shelley Gilbert, chief executive of Grief Encounter, said: “Unfortunately Kevin's an expert on bereavement. He's always said Ian Huntley took one life, but was not going to take theirs as well.”