Jay, I found no picture, but "Steamboats and Ferries on The White River. A Heritage Revisited" lists the Mill Boy as operating on the White River in 1863. The timing coincides with the Cricket being on patrol in the White during 1863.
I know this is a long shot, but it may be worth your time to contact the historical society's at place's such as Batesville, Jacksonport and St. Charles.