Visualize a realistic and futuristic full-body portrait of a character inspired by the concept of Katma Tui, an alien with red skin who is a member of the Green Lantern Corps. The character's suit is sleek, form-fitting, and features the iconic green and black color scheme with the Green Lantern emblem. Her confident and commanding stance reflects her role as a seasoned officer of the corps. The background should be a cosmic setting, filled with stars and nebulae, symbolizing her connection to the intergalactic realm and her duties as a universal guardian.