Here's what it looks like with no warm up - large thigh gap!
In Light on Yoga, there isn't a gap between his chest and his leg (and his back foot is on the ground, and his back thigh is more lifted, and his torso is turned more; you get the idea).
So one of the difficulties for me in the pose is "seating" the front leg. I feel a strong grip on the front thigh, which makes it more difficult to turn. The following are some ways that help me relax that grip.