I would say definitely continue working on it. One thing that I would suggest looking into is seeing what putting more textures in will do to it. The mountains look great and I'm uncertain if you've just not gotten to this step or not but adding something to the water and a dab of trees maybe. When working by pencil I'm always reminded of one of my teachers recommendations for verity of strokes. " Look at Da Vinci's pencil drawing. He was a master at creating texture with lines."