Hi there,
This is Bogdan from Romania.
I'm a mechanical engineer - specialized in the industrial robotic field, 3D designer and modeler (from time to time and some projects I could make the functional prototype too).
I'm doing product design, industrial design, reverse engineering, ideation, etc.
I have over 15 years experience working on various systems/devices across multiple industries, from concept to launch.
1 - it is possible to have the flake more realistic designed
2 - the gradual transition from of the edges could be improved
3 - the thin line you've seen in the middle plane will also be visible if the mold is not properly designed (that is the separation plane of the mold halves)
Regards
Bogdan