What to look out for in this posture.

1. Making sure your arms are in line with your shoulders.
2. Shoulders should be away from the ears
3. Fingers are nice and spread
4. Ensure the back leg is strong and the back knee is not bent
5. Front knee is in line the ankle
6. Shoulders should be away from the ears

 
Benefits for warrior 2
Stronger stomach muscles, Brings flexibility to back and legs, Tones your legs and strengthens the muscles, Can aid cramps in the calf and thigh muscles.
 
More about the Posture
Virabhadra’s Pose is also known as the Warrior Pose. It may seem strange to name a yoga pose after a warrior; after all, aren’t yogis known for they’re their peacful ways? But remember that one of the most revered of all the yoga texts, the Bhagavad-Gita, is the dialog between two famous and feared warriors, Krishna and Arjuna, set on a battlefield between two great armies spoiling for a fight. What’s really being commemorated in this pose’s name and held up as an ideal for all practitioners, is the “spiritual warrior,” who bravely does battle with the universal enemy, the ego.