This is the form V-Mon (never) achieves after using both the Digieggs of Courage and Friendship. (urgh...)
Except I'm lying, it's the Digiegg of Hope - however this form shows combined traits of Fladramon and Lighdramon. So powerful he is, the eyes radiate light.
Because of the mixed traits, and generally quite powerful looking, I gave Sagittarimon special attention from the lighting: radiance from the cosmos below and somber blue from the space above. The initial drafting was a pain, but I like how this turned out!
Digimon, Sagittarimon © Toei Animation, Bandai