https://www.skillshare.com/classes/Modeling-and-Texturing-3D-Portal-Gun-Cinema4d/1638412460
During this class you will get several assignments to practice your 3d modeling and texturing, including:
Geometric modeling of a Portal Gun
Texturing the model with substance 3d
Retouch the render with Photoshop
For each assignment I want you to apply what was taught in the previous lessons to your 3D model.