Error+and+Style

=How do you decide whether the following is error or style?= = = = When Chris caught you in tackle tag, he lowered you to the ground gently, so that you lay in his arms for a minute, looking up at him through the tangle of yellow hair, the green lawn wet below you. Sticks in your back. Blue eyes laughing at you. Wild knowledge in your heart. (//The Power of Grammar,// 64)= = = =If this is style, why is it effective? If it is error, why is it ineffective?=