The autumn leaves aren&amp;#8217;t the only things bursting with color in Fairfield County this season. Nearly 100 paintings by Norwalk artist John Newcomb are on view at the Wilton Library as part of a retrospective of the artist&amp;#8217;s work. Entitled &amp;#8220;Journey,&amp;#8221; the exhibition demonstrates Newcomb&amp;#8217;s experimentation with style and color over more than two decades. [...]