Tinkercad 3D Detailing Tutor

The core model is already in place inside Tinkercad; now it needs to look finished. What I want next is guidance on the 3D design techniques that let me add convincing textures and finer component-level details... (Budget: £10 - £20 GBP, Jobs: 3D Design, 3D Graphic Design, 3D Modelling, 3D Rendering, 3D Visualization, 3ds Max, Tinkercad)