something I try to avoid is having flat looking scenes; using things such as fake shadows and making textures on the side opposite to a light source darker, you can achieve a very realistic effect.
All I did to create these was make a gradient that fades out then blur the edges with an angle!
also using billboard GUI’s to make bright lights is another effect.
this again is just a simple decal I created using blurs and motion blur in external software.
the outcome: it makes scenes look a lot more realistic as shown below!
(questions I get is if I bake in blender to do this, although I’ve played with it I don’t think baking large scenes in blender is a good idea due to low resolution Roblox supports so I came up with this method)