Currently there is a Jane Freeman painting of a young school boy on Ebay listed for $1,900. That should give you a starting range.
Jane Freeman, 1871-1963, was famous as an illustrator and a portrait painter. The picture you describe was one of her most popular, and it was reprinted numerous times, made into puzzles, etc. Some of the better reprints have been done with simulated brushstrokes, but they are still simply copies. The original painting is in private hands, so it is most likely that you have a print. For insurance purposes, your copy is worth anywhere from a few dollars to $100, depending on type and condition.
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