Art by Eugène Roorda & Mart Boudestein

These two names don't appear to represent a joint artistic practice, worth flagging directly rather than inventing a shared biography. Eugène Roorda is a Dutch advertising executive from Friesland who founded his own agency and has written and taught on marketing and branding; nothing in the record suggests he works as a visual artist. Mart Boudestein, who died in 2023, was a Dutch photographer trained at Rotterdam's Willem de Kooning Academy, known for portrait and nude photography shown through Fotogalerie Roel Sandvoort, who also worked commercially in advertising, which is likely where his path crossed Roorda's. If this credit is meant to represent something more specific than that overlap, it may be worth checking the original source.