The portrait of the Baron of Flödnig (Smlednik), who gave a Baroque appearance to his Mansion, was tentatively attributed to the Swabian painter by Anica Cevc, with the caution that it is only a suggestion, since there is not enough comparative material for this motif in Gabriel's oeuvre to reliably attribute the painting to his brush. Around 1770, Eustachius Gabriel was commissioned by the Baron to paint the ceremonial hall of the Flödnig Mansion; he depicted an allegorical scene of Apollo on a sun chariot surrounded by a zodiacal circle and personifications of the twelve months and four seasons. The high-quality portrait shows the sitter in a waist-length cutout and three-quarter turn, leaning on a carved Rococo table and with a book in his left hand, which corresponds to the established representative depictions of the nobility of the time. The Baron was also known as a great lover of books and he arranged an extensive and rich library in the Flödnig Mansion.
Due to the stylistic similarity with the portrait in question, Anica Cevc also attributed another version of the Baron’s image, slightly more casual, to Gabriel, in which the Count’s hand is tucked into his vest. This portrait, too, is kept in the National Gallery of Slovenia (NG S 647).