Some days this pose just feels so right: weight perfectly balanced over a stable base, evenly spread through both feet; hand resting wherever it lands. As the heat of the studio allows your muscles to relax you might find yourself able to move your hand further down.
Wanting more of a challenge? Allow your eye gaze to look up towards your hand and check your posture. Think, “Am I leaning forward? Do I need to straighten up more and imagine that my back is against a wall? Can I extend my arm and stretch my fingertips higher towards the ceiling?”.
Then just enjoy the moment, celebrate your journey and most of all breathe!