Because it's for a design contest, I focused on design and did my best to make sure it could be captured well with a fairly simple flat art style.
This design is centered around the concept of "the beauty and goodness which comes from limits and struggle"
My first idea for this is these flowered chains, where chains are often heavy and used to restrict movement and freedom, but instead I've subverted that by covering them in flowering vines which use these chains as a foundation to grow on. This truly good angel's ethereal energy lifts these chains up, giving them a near weightless look, still a visual reminder of their past weight and the ways they shaped this angel's past, but they no longer have power to limit the angel's future.
Following the flower motif, the angel's upper body is clothed by multiple layers of loose cloth with golden trim, which too defy gravity under the angel's power. The layered bunching look of the fabric too evokes the image of the petals of a flower, showing how the angel themself has blossomed in much the same way as the flowers on the chains. Even still their hands are covered by a cone of fabric each, secured at the wrist. Their hands are free to be used, but generally remain hidden under the fabric. This too is part of the theme of restrictions and breaking through them.
I've drawn the skin and wings as #FFFFFF white, but this is a stylization which doesn't need to be taken as the literal color. I personally imagine that in a realistic rendering, this angel's feathers are as white as a white dove's, and that the skin is uncanny in how white it is, almost like opaque marble for skin. If you would want the skin a different color, the wings would still match the skin. The feathers also capture light in a way which gives them a slight golden shimmer.
I haven't named them, but I do imagine them as some flavor of nonbinary.