This is my first piece made up using 3D. I had a week of learning how Blender works, and then I just created this scene, then made a line sketch out of it, added light and color and finally detailed. All steps are below. There's much more to learn, but I'm satisfied by the result so far.

step 1: 3d scene how it looked and rendered in Blender

step 2: line sketch

step 3: adding some color and light