James Young, a teacher at the Buffalo Creek school, wrote about Dennis, "in acquiring the arts he has had no instruction except what he has received from copying." Two almost identical watercolor paintings were painted by Dennis to adorn collection boxes. "Seneca School House" is dated July 3, 1821, and "Seneca Mission House" is dated April 16, 1822. "Seneca Mission House, Nov. 15, 1821" features girls studying in Mrs. James Young's class. Quotes about the nature of work hover over a scene of Tuscarora girls, busy as a variety of spinning wheels, overseen by an elaborately coiffed Mrs. Young at the paintings' left. Two of Dennis' other paintings survive. Dated March 4, 1822, "Evening Psalm" is a watercolor on paper, signed by the artist. The painting features two Tuscarora warriors – one standing with a bow, the other seated with two firearms – and a Tuscarora woman with a baby resting on her shoulder, tucked inside her robe. The three are flanked by loose, painterly foliage, and a dense tree, in which Dennis scraped the paint away to produce highlights. The background is filled with undulating blue hills, lined with evergreen trees. The narrow slice of sky is filled with a variety of cloud formations, and a minute sun tucked in the far left corner. Details of the figures' faces are minimal. Dennis relies on outlining to define shapes and cross-hatching to provide shadows and mass. Above the scene, the artist wrote a
psalm in
Seneca and English. The last painting, "Christening of the Tuscarora Asa Thompson," is unsigned but dated 1821. Attribution is based on style and documentation that accompanied the painting. The watercolor painting features a Tuscarora woman handing her baby to an Iroquois man, wearing a
fingerwoven sash, leggings, and moccasins. To his right in the minister, holding a Bible and extending his right hand. Both men have top hats. The background foliage is even more whimsical than that of "Evening Psalm." Swaying trees cover rolling hills around the edges of the scene, but the center of the painting has large unpainted, negative space, providing contrast the figures. ==Legacy==