Aim to get the triangle to be approximately the same width as the eye above it and no longer; the highlighted triangle should also stop before crossing past the nose, so it might take some finessing based on the model’s face.
If you’re working with studio lighting, move your key light up or down until that signature triangle appears below the eye, or slightly turn your model’s head to get the positioning just right. Aim to get the triangle to be approximately the same width as the eye above it and no longer; the highlighted triangle should also stop before crossing past the nose, so it might take some finessing based on the model’s face.