Starter content fire problem

Hello!I made a forest and i tried to make the sky be black and make night. http://imgur.com/a/75kDS It’s not so good.After adding a fire i found that if i look at the fire and then at the forest everything is very black. http://imgur.com/a/7dHDi Can someone tell me how to resolve the problem whit the fire and improve the sky? Thank you!