IMO people should be remembered as the vibrant human beings they were before the illness/accident whatever, steals them from us.
I helped nurse my father through cancer and dealing with it on a daily basis means that after a while you don't really 'see' what's happening to them. It took such a long time after he died to come to terms with losing him but, as you do, I came through it; to the point where I started to only remember the better times, the happier and more lively times.
However, recently I came across a photograph that had been taken at Christmas (approx 5 months before his death) and to say I was shocked by what I saw would be an enormous understatement. The emaciated and skeletal person in the photograph wasn't the Dad I loved and wanted to remember. It insantly brought back all the pain, anger and frustration of having to watch him die all over again and I was sent right back to square one on the grieving scale.
On those who like to have/keep these kinds of photographs I pass no judgement however for me they are most definitely a no no.