Who knows Otto Eerelman?

While working through my collection of small circular stamp prints, I came across a beautiful postcard. A card with an image of a painting by O. Eerelman on the back. Not in color, but in blue-black tones. Intrigued, I went looking for the artist: O. Eerelman.   Otto Eerelman was born on March 23, 1839, in Groningen. Eerelman was the son of Samuel Eerelman, sexton of the A-kerk in Groningen. From a young age, he was drawn to drawing and painting. Against his parents' wishes, he chose a life as an artist. He began his studies in 1860 at the Academie Minerva in Groningen, which he completed in 1863. He decided to continue his studies for another year at the Royal Academy in Antwerp and subsequently spent a short time in Paris. Eerelman returned to Groningen and worked at the Academie Minerva from 1867 to 1874. After living and working in Brussels for a year, he came to The Hague in 1875, where he lived and worked until 1902. During that period, he regularly received commissions from the Royal Household. An equestrian portrait of Queen Wilhelmina, created by Eerelman, is located at Het Loo. Throughout his life, Otto Eerelman had a great fondness for painting dogs and horses. Among other works, he created a watercolor titled 'Farmer's Cart with Two Horses' on a country lane. A typical depiction by Eerelman.   But was the small artwork really by Eerelman? While searching the internet, I came across an image that was identical to the image on the card, but now in color. However, it was stated that it was a painting created by Anton Karssen! Eerelman's painting titled 'Farmer's Cart with Two Horses' looked very different. Had the publisher of the card, Mrs. AM Amiot from The Hague, made a mistake here? That remains the question for me for now. What mattered to me was the beautiful impression of the so-called small round stamp of St. Nicolaasga, dated August 19, 1899. This stamp was issued to the auxiliary post office on August 25, 1893, which used it until the end of 1905. A nice postal item for the collection of small round stamp impressions, a beloved type of stamp among many collectors.