30-year-old Gavin Williams had spent 15 years in and out of custody, culminating in being incarcerated at HMP Parc in July 2010.
Despite his claims to never having picked up a paintbrush before his time in jail, the Invisible Walls project helped him nurture a talent for art.
His murals became a distinctive feature on the walls of the prison, and after his release, Gavin started his own painting business.
"My eyes have now been opened to the damage coming to places like that do to families" he says.
"Having that guilt has made me more determined to be more successful in my life and not to go back to the same place".
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A chilly start but warming up into the afternoon with decent spells of sunshine and light winds.
The charity says police aren't making full use of laws which can provide information on people suspected of harming children.
Showers will clear this evening to leave a largely dry night with clear skies. Temperatures expected to tumble with a risk of frost in parts