How do I model a light holder for bicycle in SolidWorks ?
The basics of solidworks...
Make a sketch, extrude to the required thickness.
Than add the holes on the required plane (sketch) / cut extrude.
Than the tiny details...sketch/extrude. etc eyc.
Do not for get to round the edges with the required radius.
You can add the bolt in an assembly..
Give it a texture, and render.