In "There Must Have Been an Angel by My Side," the central figure is a black man, depicted with striking clarity against white backdrop. 

The title of the painting, "There Must Have Been an Angel by My Side," adds another layer of meaning to the imagery. It suggests a sense of divine presence or guidance, perhaps symbolized by the flowers themselves. The juxtaposition of the man's blackness with the purity of the white flowers hints at themes of spirituality, protection, and transcendence.

As with much of Oliveira's work, this painting resonates with deeper meanings related to love, fragility, and the experiences of black individuals. Through his masterful use of symbolism and composition, Oliveira invites viewers to explore the complexities of identity, spirituality, and the unseen forces that shape our lives.