It’s looking really great, you’re making good progress.
For the neon on the carbon fiber you can make an extra mesh on top with that shape and give it a glowing material.
If you applied the mirror modifier after you unwrapped, the UV islands must be one on top of the other. You can unwrap again or manually move them. If there isn’t a two set, then make sure the seams are there and unwrap again.
I’m not sure about Photoshop, but if you can get the image that the brush uses out of it, you can load the image to Blender for sure.
