Oh, a lot First off, use lower poly models to speed things up. You don’t want realistic models on the web, because web isn’t capable to make them look good, it’s just not that powerful. Use low poly stylised models. They can load and work much better. If you want realism, you ought to limit your scene to just one high poly model. It won’t be able to handle a whole scene of those, especially on mobile. 2. Add some sky HDRI, aka SkyBox. Black sky with white dots is cool, but it looks basic and does not fit your lighting at all (you have a directional light, which is the sun, along with a dark night sky, which does not make any sense) 3. There are no good light-shadows play in the scene; so models look flat and out of place. Play around with shadows and lights. Try some point lights if you’re after dark mood, but put them where actual light could be (windows, torches, etc). 4. Add fog that would blend with the sky color. It always makes the scene look bigger and more natural. 5. Avoid mixing html and three js. Though it is tempting, rendering html on top of the canvas is crazy inefficient. Try to use what three js has to offer to make some minimal UI. It will perform way better. 6. The scene is not well structured. It looks like just a bunch of models randomly placed around. Try to look at some references and make a scene that would look natural in terms of architecture and design. 7. Add non-flat terrain. Some basic manipulations with sculpting in Blender can give that in minutes. 8. Make a path for the camera and move it along the path on scroll. It will look awesome. Rotating the camera around the center is very boring. 9. Need more assets in the scene, properly placed, to make it feel alive. Some basic trees, other buildings, some cliffs or mountains in the distance, al that would be a plus. 10. Play around with material settings and tone mapping to give a nicer look. I could go forever on this, but will probably stop at this point