What is the value of a painting of Jesus Christ by Gab Max in 1874?

There doesn't seem to be a consensus with prices on eBay ranging from $9 to $95,000. Some people are convinced prints of this painting are worth around $15,000 but Wilcoxhallappraisers had this to say: "this picture is also known as "St. Veronica's Handkerchief". The original was painted by Gabriel Max. an Austrian, born in 1840, died 1915. The original painting is valued at $25,000.00, and currently is in a private collection in Prague, Austria. Prints like this one of the original often sell for less than $50.00." wilcoxhallappraisers: 9/15/2003 12:47:29 PM

how do i find out exactly how much the oi painting that i have is worth 1874 Jesus christus by gab max