A fact from Ambroży Mieroszewski appeared on Wikipedia's Main Page in the Did you know column on 4 April 2008, and was viewed approximately 1,308 times (disclaimer) (check views). The text of the entry was as follows:
Did you know... that the earliest known portrait of Frédéric Chopin, painted by Ambroży Mieroszewski in 1829 when the composer was nineteen (pictured), was lost in the opening days of World War II?
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To me, Ambroży Mieroszewski is notable as the painter of the earliest known portrait of Fryderyk Chopin, and seemingly a fairly accurate one, too, which is discussed by Édouard Ganche and Zdzisław Jachimecki. (Have you seen some of the rather unconvincing later portraits done by other hands?) Mieroszewski also painted four other Chopin family members, in the same year 1829. In my view, if he had never painted anything else in his life, he would still have been notable. Nihil novi (talk) 23:46, 28 March 2008 (UTC)[reply]
You will also have noticed, among the external links you provide, the 1968 attempt by Anna Chamiec to reconstruct in living color the lost Mieroszewski portrait of Fryderyk, and the 1969 attempts by Jan Zamoyski to do the same for his parents and sisters. Why would anyone bother reconstructing non-notable portraits? And I would venture that it is an art work's notability that determines its artist's notability. Nihil novi (talk) 03:30, 29 March 2008 (UTC)[reply]