To make attached lines invisible, put putty and clean it.
Here, too.
Here, too.
Apply putty all attached lines and leave it at least one day to dry.
These are all parts which applied putty. I will sand them tomorrow at a time.
To remove parting lines, I use a fine thin blade knife. Put it at right angles to the surface and move it to the direction of lines several times with slight pressure.
Remove pin marks with putty.