While this may not help you with laser particles, I hope this can help you in other builds.
Break up flat surfaces. What this means is that when building something, (like a wall for example), you should add things to flat surfaces so that it looks less “plain.”
Like adding pipes to walls as an example, tiles to a floor, or just a few posters on a wall can go a long way in improving your builds.
The same concept can be used (albeit less frequently) in improving smaller Roblox models (like gun models, sword models, or whatever you want to make.)
Credit to my friend “SamsAltAcc0unt” for teaching me these things.