If you're going to do an outline (which I think could really help the scene provided it's subtle), you should have it a shade darker and possibly even a slightly different hue than the texture it outlines. Not exactly sure how you would make a shader or whatever for it but... that's how it should be done! :icon15: Edit: of…
Outline! Adds a little more definition to the objects. Would it be possible to use thick and thin lines depending on the objects view? For example put a slightly thinner outline on the object and a thicker one around the silhouette. Also agree about colouring the outline to match the objects diffuse colour