In his early age, Viérin showed an interest for drawing and painting, probably under the influence of his father, an art lover.

In 1894 he went and spent six months in Algeria, experiencing highly luminous landscapes and meeting several artists residing in Biskra and Constantine.

[1]Viérin's works until the mid-1890s are of a realist style in line with those of the Barbizon and Tervueren [fr; nl; de; es] schools of that time.

Despite a twenty-year age difference between the two, Claus maintained a friendly relationship with the young Viérin, encouraging him to go and paint Flanders’ seaside light and landscapes.

The subjects of his works were mainly landscapes, beguinages, seascapes, beaches and dunes, windmills, farms, village houses and streets.

He was also invited to participate in exhibitions held abroad in places such as Milan, Rome, Venice, Barcelona, Amsterdam, The Hague, Rotterdam, Maastricht, Munich, Oslo, London, Buenos Aires, Lisbon and in the USA (Pittsburgh).