Beginner: Chest lift is a joyous and expansive pose for the beginning practitioner. Keep your pelvis slightly tucked and think of lifting up from the pelvis, through the abdomials, through the chest and out through the arms. If you feel compression or tightness in your spine, bring the lift back to a more comfortable place.
Advanced: Advanced yogis can deepen in chest lift by really rooting the feet as the chest lifts up. Are your shoulders down and relaxed? Be mindful of the rotation of the hands and the placement of each finger; they should be energized and continuing the line of the arms into space.