Bouldin's commission fee by 1989, was $25,000 for a portrait.
In the art world, a painting that is an anomaly to the known style of an artist usually does not command as high of a price as works are recognizable. However, in your case, the subject of your painting, being a steamship race on the Mississippi of historically well-known boats, is in and of itself desirable. That too, should carry a $25,000 insurance or replacement value.
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$25,000 per commission was considered the height of his command price.