What am i doing wrong???

[jks_photo]

Hi guys,

what am I doing wrong with the following picture???



I did a long exposure with a flash at the back of tree remotely triggered and set to second curtain sync. I was kind of hoping to give the tree a somewhat "white glow"rim lighting effect but I didn't seem to be able to achieve that with this and the other pictures I didn't bother to post.

shot was at 8sec f5.6 ISO250 flash was about 4 feet at the back of tree [ limited space] power was at 1/2 flash power.

please help.

thanks for looking


james