I would like to suggest an old costuming trick when asking yourself, "what does this picture need?". Look at the sillohuette. How does the picture stand if it is only a sillouhette? Currently your guy's sillohuette isn't so bad but your heroine melts into the building, the sword stands out which is good. Without changing any lighting at all you could improve the composition by rotating the building around so that the Herione is framed in the space between towers Just to underscore the post by Ainle as I think it is the core advice you're looking for. Ambient settings in materials, too high. This is what makes your wall behind the herione almost the same value is she is. The bottom of her boot is the same value as the top of her boot. The inside of the temple is actually brighter than the front of the wall. These values being close together work well when you're going for a feeling of serenity or softness which is currently in stark contrast to the violence of your characters. So far I don't think that is what you're going for. The angle of the sun is too high for sunset. Your shadows still say 3-4 o'clock, to me.Setting it lower will give you longer shadows and as Ainle said you'll get more drama. Without lowering the materials ambience you'll just get more dramatic mush. The sky should be darker at the top for your sunset/twilight time. I agree with queri, if you have paint solution use it but I would recommend getting the best render possible first. Lastly, I will be posting my similar "problem-child" soon and I encourage you to have a view and "bang on it" as you will.