We follow Abraham, a lover of photography and film who has grown up with cameras his whole life. Following an incident at a Sydney beach where he is bashed by a group of youths and has his Nikon D300 stolen, the youths use it to film a night out through Sydney City while Abraham struggles with feelings of frustration, pain and anger as well as unanswered questions to Sydney’s growing epidemic of senseless violence. As morning breaks the next day, the head youth is set upon by younger youths in an area where Abraham also happens to be in, leading to a fateful, dramatic face-to-face encounter with he and his youthful assailant.

What if in addition, the youth have filmed themselves making some crime from their own POV, and Abraham's D3000 is found on the crime scene by the police? Too obvious?

I would recommend that you watch "Crash" by Paul Haggis and "The 25th hour". The "25th Hour" has a couple of great scenes notably the one where Edward Norton's character finally realises and admits to himself that he is the one that messed up his life.
If your script can have a scene as powerful as that one, then you'll have a great script.
I believe that you already have the right ingredients to get there.
I would suggest that instead of a standard linear narrative, you use a double journeys narrative. Your script has two protagonists who both deal with the loss of a loved one. Their journey toward acceptance and past the previous stages of grief mirror each other's. It concludes when they finally meet again. The movies "Heat" by Michael Mann, "The departed" based on an Asian movie "Infernal Affairs" follow that double journeys narrative. Two sides of the same coin.

Rejected by their family, betrayed by their friends, a violent petty criminal and an absent father photograph must reevaluate their life in their last night filled by drug, alcohol and violence before the funeral of a loved one.