Some portraits happen in a studio, under measured light and with deliberate poses. Others — like this one — are pulled from the water, quite literally, in the midst of motion and adrenaline. I caught her just after she emerged from the sea, hair dripping and muscles tense, her expression still riding the wave of effort and triumph. The Nikon D750 paired with the Sigma 150–600 Contemporary gave me the reach to stay back and let the moment unfold naturally, while still pulling in the details — the salt-speckled skin, the flushed cheeks, the tension in her arm as she grips the swimming cap. From a technical perspective, the challenge…