The traits will effect how the paintings look. What traits does your painter have.
Some of the effects traits have on painting are:
Artistic - Gives a water-color effect to the painting, though with highlighted border effects on the object of the painting.
Can't Stand Art - Darkens the painting with higher contrast and heavier, thicker brush strokes.
Computer Whiz - Gives the painting a square-tiled effect, obliterating any detail.
Evil - Tints the picture heavily towards red, most details are left intact.
Grumpy - Tints the picture heavily towards blue, most details are left intact.
Genius - Tiles the picture into small white-bordered hexagons/pentagons.
Insane - Obliterates detail, makes colors more flat and contrasting, shapes become jagged.
Neurotic - Turns the painting into a bright neon mess.
Virtuoso - Adds a white flair effect to the painting, most details are left intact.