photorealistic mirror selfie in a modern fitness gym, same facial identity as Bex, standing in front of a large wall mirror holding a silver smartphone while taking a selfie, wearing a white athletic sports bra and light pink high-waisted tight fitted workout shorts, modern gym interior with treadmills, benches and workout machines in the background, large windows showing a distant city skyline and water, LED strip lighting on the ceiling, bright natural daylight mixed with indoor lighting, realistic mirror reflections, smartphone photography style, ultra photorealistic fitness lifestyle image, 9:16 aspect ratio
