ya your hard work looking in ur scene
it is looking nice.........
bt ur scene is burned out where key light is effected ,light intensity should be a little bit low
and add a occlusion pass also in it occlusion pass will give it depth
another thing in this scene that a black area is showing what is it?
if it is ur window , make it white or some environmental color because i think it is ur light source
It looks if you boost the render setting up to production quality it might do alot to increase the line quality, it just looks a little jagged especially on your shadows, which can also be fixed by turning up the shadow quality.
