Kasper works both from his studio but also enjoys plein air painting. He has won several awards for his outdoor paintings. In August 2020 he was first price winner in the Art In The Open festival for his painting ‘Butter Slip Lane’ in Kilkenny. Also in July 2021 he was first prize winner in the Dublin Plein Air festival for his painting ‘Malahide Abbey’ in Malahide Castle.

His watercolours are a mesmerizing blend of realism and poetry, elevating the mundane into a dreamy and ethereal realm. Using a masterful combination of clear colours, free expressive brushstrokes, and 'lost and found' edges, Kasper artfully captures the interplay of light on the city's buildings and streets. The end result is a unique painting full of atmosphere and character, carrying his personal touch and creating a lasting impression on the viewer.

Kasper Zier is a member of the The Water Colour Society of Ireland. He won the Presidents Award in 2024 for his painting 'Morning Light'.