Not Lighted Crossword

Not lighted crossword clue, 5 letters. The Courier-Mail daily quick crossword on Aug 15, 2017

Answer: UNLIT

Not lighted example

I have a problem with the lights,because this is a topic that I have never studied well. I don’t understand because the scene that I created is not lighted very well. I’m using the sky texture as background in cycles render. I have also placed a sun light on the scene and I have increased its strenght,but it seems that it is not working. Problem is that the facial features,the shoes and the hands of the boy are too dark. Instead,the girl is better lighted…can you give me some suggestion ? thanks.