He has been selected for all open submission exhibitions in Ireland, particularly the Royal Hibernian Academy RHA, Dublin annually since 1982 and EVA International, Limerick in the 1980s/90s.
[10] Walsh's work has dealt with a variety of subject matter using an abstract visual language throughout his career: the Stations of The Cross ('Fourteen Points of Entry', 1991, now in the collection of the Irish Museum of Modern Art, Dublin); the encroachment of and into an individual's personal space ('Ambit' paintings, 2001–2002); his father's wartime experiences ('Airborne Drawings' 2002); interpretations of ancient classical art motifs ('Frieze' paintings and drawings 2006–2007).
In November 2007 a major body of work by the artist based on 'The Divine Comedy' by Dante Alighieri opened at the Limerick City Gallery of Art.
The 'Inferno' section travelled to CIAC, Pont-Aven, Brittany, France in May 2008 and was shown in its entirety again at Triskel@ESB: Caroline St., Cork in January 2010.
He showed new paintings at VISUAL, Carlow in September 2011 entitled: 'The Coercion of Substance'[11] that subsequently travelled to Drogheda, Co. Louth and Letterkenny, Co Donegal.
[citation needed] Walsh has been selected for international artist residencies in Switzerland in 1990, France in 1995 & 2002, the US in 2009, Berlin, Germany in 2012, 2015 & 2018 and Madrid in 2016.
Following an artist's residency in Berlin in 2018, Walsh began making drawings, studies and paintings based on 'The Odyssey' by Homer.
In these 'Odyssey' paintings, the lines represent characters, so introducing in linear form the many participants in this famous piece of literature, all of which are identified through different colours.