The bright colors that the Dora Milaje could be wearing visually sets them apart from the rest of the warriors.
The Dora Milaje, an all-female warrior squad serving the king directly, were introduced in Civil War as well with Ayo (Florence Kasumba) standing tall against Black Widow.
One of the areas in Wakandan lore that a more traditional approach is taken is in the design of their army.
The quality of the photo and distance that it was taken makes it impossible to determine who exactly the supposed Dora Milaje member could be.